
Reksew_Trebla |
So an idea I have is for an Unfettered Eidolon to build up in CR as the battle progresses.
Another idea I have, though for a Gestalt game, is to remove the rule that you can't stack different forms of Rage, and have a Bloodrager//Unchained Barbarian, that starts off not (Blood)Raging, then (Blood)Rages, Greater (Blood)Rages, and finally, Mighty (Blood)Rages. This would give the feeling of getting stronger, without having to build entirely different forms, like with the Unfettered Eidolon idea.
The final idea I have is to use the Wound Thresholds rules from Pathfinder Unchained, except, instead of getting penalties with each wound threshold, they would get bonuses. Endurance, for them, would also now increase the bonuses by 1, instead of decreasing the penalties by 1.
How would you do this in a game? Note: It doesn't have to be homebrew/house rules, it's just all my ideas fall under such, so I figured it would be best to put the thread here.

Quixote |

I would...just build three separate opponents (or however many you want forms for) and have them do a brief monologue and transformation scene when one is removed from the fight.
What sort of encounter are you looking for?
If we're going by the Final Fantasy genre of the trope, I'd imagin they start as a powerful magi-sort of opponent (gestalt magus/brawler or something?), who "transforms" into a immensely muscular version of itself (warpriest/barbarian?). Then they unfold into some kind of mountainous, tentacular horror (giant lake octopus sorcerer?), and finally into an otherworldly version of their first form (glowing eyes, shifting tattoos and you can't forget the classic one angel wing/one demon wing-type of aesthetic that FF is so fond of.)

zza ni |

been there done that.
9th+ level nimble guardian npc monk (the prince's personal guardian). most of the time he's a little kitten (Diminutive animal, young cat form) then goes into normal medium catfolk for normal threats. then if need to get down to buisness turn into a huge warcat form.
he got a Ring of Eloquence to talk in any form. and ring of ki mastery to make sure it only cost 1 ki to change shape (he can probably technically also take large and tiny sizes and spread the 'not final form' in a real Dragon ball manner from the level 7 beast shape ii ability)

Reksew_Trebla |
What sort of encounter are you looking for?
Nothing in particular. I was just wanting to have that familiar feeling of a boss that keeps getting stronger as the battle progresses.
I have my ideas, and am probably going to do the Unfettered Eidolon idea if I do this, with the Mutant template stacked on as many times as I need it for CR 21-30, since the rules for building Unfettered Eidolons only goes to CR 20, unless I want to wing it with the normal Monster Advancement rules, which I don't. Also could try class levels for CR 21-30, but I feel like the Mutant template gives a similar feel to the unique advancement rules for Unfettered Eidolons.
Anyways, like I was about to say before I got distracted, I have my ideas, but I wanted to see other people's ideas as well, for variety's sake.

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One encounter I'd want to run is a swarm bursting from a body. The players hit the body and immediately things get so much worse. You can easily do this at lower levels with a giant spider, a spider swarm and a zombie covered in webs.
Another example is the undead abomination. The BBEG immediately rises as an undead horror after he's been killed. Unless the players manage to cast Temporal Stasis, ofcourse.

Tim Emrick |

I think the closest I've come to this was one of the bosses from the "Gorilla Island" adventure I devised for my Freeport campaign. I built a high girallon with a few levels of cleric, and created a version of the demon-possessed template (from Green Ronin's Advanced Bestiary) based on a baregara. (It's a CE outsider, but not a demon. However, it fit the simian theme better than any true demon did.) That brought her up to CR 11, which was a challenging solo encounter for the PCs after fighting their way through the rest of her tribe's lair. Then, when they defeated her, her blood rose up into the air and materialized into the baregara that had been possessing her all along--which was CR 12, when they were already low on resources. It was an epic fight!
(In hindsight, I probably should have given her a language in common with the party, just so there could have been more opportunity for villainous banter.)
You could add another stage to this method by having the villain not be possessed to start with, and just fighting at their normal power level. But when they hit a certain level of hurt, have them produce and use an item that unleashes a fiend, which promptly possesses them and boosts their abilities by a couple CR's. Then, when the combined form is defeated, have the (unhurt!) fiend itself materialize to fight the party. Templates like demon-possessed, devilbound, etc., vary in CR adjustment by how powerful the possessing fiend is, so choose a middling-to-powerful one whose own CR is a little above the host's CR while possessed.

VoodistMonk |

I have a Kasatha Tetori Monk that turns into a freaking spider at around level 15 due to Fiendish Obedience Mazmezz... four arms, eight legs... Hamatulatsu, Hamatula Strike, Throat Slicer... gross.
You could have the transformation happen halfway through a battle, if you wanted... just level up the bad guy mid-combat... poof, size large spider Monk, full health, and a few new tricks...
Using the Evangelist prestige class gets you Spiritual Form, which could further add wings or a tail...
"Behold my true power!!!"
-Dracula, Castlevania SoTN.

yukongil |

back in the olden days of 3.x, I got the Book of Vile Darkness and there was a feat called Masochist(?) that any time you took 50+ points of damage from a single hit, your strength got a +2 bonus.
Once my party hit 20th, I sent a Red Half-Dragon Troll Barbarian after them with the feat. The main fighter-type couldn't do less than 50 per swing and just kept hitting him, but thanks to his immunity to fire and regeneration, they couldn't kill him, just knock him down for a bit. Eventually he got up and backhanded the Cleric who had wandered to close. I rolled the trolls damage out in the open, like a 1d8 or so, rolled a 2, announced the cleric took 143 points from the swat...they had hit him, just so many times!
My PCs actually begged OOC for the fighter to stop hitting him. Good times, good times.

Quixote |

Right? Exalted Deeds had some great stuff in terms of the philosophical implications of being the Goodiest Good and what that meant in a game that had objective Good and Evil.
Meanwhile, it's evil twin gave us an interpretation of evil that ranged from immature to actually comedic to downright offensive. I mean, I liked the way they described and gave of an example of different types of evil people and stuff like that...but that was like, 2-3 pages.
That is a pretty great opponent, though. I ran a half-black dragon pyrohydra a while ago to similar (but obviously less devastating and hilarious) effect.

Mark Hoover 330 |
BoVD gave me one idea I ever actually used: there was a villain in the book that just had normal, mundane victims chained to him such that any attack on him had the chance of hitting an innocent.
I took that and ran with it recently for an interesting encounter where there were mundane, innocent NPCs chained to the sides of massive lizard creatures which in turn were being ridden by demons. If the PCs wanted to target the bad guys with ranged or AoE attacks, they had to be extremely careful.
As for shifting forms villains, I agree with qui-fly upthread; just make multiple foes, each stronger than the next, and just say that as one form dies another takes it's place.
@ D-man: I once had a low-level encounter which was zombies filled with alchemical ooze swarms. Any amount of Piercing or Slashing damage caused the slime to burst forth onto the attacker. I used the Sanguine Ooze Swarm, basically meaning that the ooze would infest a living host, stick to them, slowly deal 1 pt of damage to them every round and EVENTUALLY, if never removed from the host, said host would reanimate as one of these carrier zombies.

yukongil |

Right? Exalted Deeds had some great stuff in terms of the philosophical implications of being the Goodiest Good and what that meant in a game that had objective Good and Evil.
Meanwhile, it's evil twin gave us an interpretation of evil that ranged from immature to actually comedic to downright offensive. I mean, I liked the way they described and gave of an example of different types of evil people and stuff like that...but that was like, 2-3 pages.That is a pretty great opponent, though. I ran a half-black dragon pyrohydra a while ago to similar (but obviously less devastating and hilarious) effect.
that feat and the picture of the "cloud fist" smashing some poor sod on a hill (Fist of a Vengeful God, or something like that) are about all I remember from that book, though now that Mark mentioned it, I do remember the Emperor Armor with the chained urchins.
Still, better than the Book of Erotic Fantasy...ick.

Mark Hoover 330 |
Yukon Platinum: gross.
At the OP: another way to do this would be ever escalating swarms. Rather than using the swarm subtype, have the creature initially fight like a humanoid or whatever the base form is, then when it's "killed" it becomes a Swarm of the appropriate CR, then a couple rounds later that first swarm is joined by another to reform a bigger, tougher version of the base form, and so on until you get too bored.
Meanwhile, if you select this option, there might be a way to keep future swarms from arriving. Put something in the environment, like clusters of hives or nests or whatever. If the PCs can destroy these environmental features before a new base form is created, the creature can't re-form.

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BoVD gave me one idea I ever actually used: there was a villain in the book that just had normal, mundane victims chained to him such that any attack on him had the chance of hitting an innocent.
I took that and ran with it recently for an interesting encounter where there were mundane, innocent NPCs chained to the sides of massive lizard creatures which in turn were being ridden by demons. If the PCs wanted to target the bad guys with ranged or AoE attacks, they had to be extremely careful.
I took that 1 step further.
Exotic weapon proficiency (Baby in a sack)Weapon Focus (baby in a sack)
Shield proficiency (7 year old child)
Armor proficiency (babies strapped to body)
Then charge at the paladin. If the babies die it's his fault for not dodging.

Quixote |

Oh, right. The Dread Emperor, the guy who just said he was the emperor of the world, lived like...on the Astral Plane? --and occasionally frequented large cities to buy/sell/trade magic items and replenish his stock of children he used to take damage for him and to power metamagic spells.
And the Crushing Fist of Spite. 20d6 to one 5f5 square per round. "What do you do with the highest level of magic available to mortals?"
"I punch folks. With an evil hand."
I also liked all the ones that hurt you to cast, like: you cut off your hand and it turns into a spider! You spit your tongue out at people and it, like, grabs them and stuff! You spit your tongue out at people, but it turns into a snake this time! Your fingers explode off your hand like little missiles!
For this transforming boss fight though--or for any 1 Vs party encounters, really--I wonder if giving an opponent multiple turns in a round would help much? And multiplying hp. Like, if they've got 3×the hp and take 3 turns each round, but don't have 3×the attack bonus or damage...that would hopefully make the combat last more than 2 turns.

yukongil |

Oh, right. The Dread Emperor, the guy who just said he was the emperor of the world, lived like...on the Astral Plane? --and occasionally frequented large cities to buy/sell/trade magic items and replenish his stock of children he used to take damage for him and to power metamagic spells.
And the Crushing Fist of Spite. 20d6 to one 5f5 square per round. "What do you do with the highest level of magic available to mortals?"
"I punch folks. With an evil hand."I also liked all the ones that hurt you to cast, like: you cut off your hand and it turns into a spider! You spit your tongue out at people and it, like, grabs them and stuff! You spit your tongue out at people, but it turns into a snake this time! Your fingers explode off your hand like little missiles!
For this transforming boss fight though--or for any 1 Vs party encounters, really--I wonder if giving an opponent multiple turns in a round would help much? And multiplying hp. Like, if they've got 3×the hp and take 3 turns each round, but don't have 3×the attack bonus or damage...that would hopefully make the combat last more than 2 turns.
Trailblazer had a boss system like that, you multiplied the BBEG's hit points by the number of PC present* and they also had an action(hero) point system that only bosses could use for extra turns. I've found they help a great deal with solo-boss encounters.
*should a PC fall, they recommend just silently taking off that portion of the extra hit points

Alzrius |
If you don't mind going third-party, the Horradin class (affiliate link) from Little Red Goblin Games is all about successive transforming as a means of powering up.