
Paul Murray |

Dave, Morgan, Andrew, Steve, Chris, Bevis - no peeking!
What are the stats for pumping the froghemoth to gargantuan? I need it this big so that it can swallow whole our half-ogre (size l), whose player is leaving town this weekend.
Not that I'm the kind of DM who specifically targets characters, oh no.

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Adding 5 HD to Madtooth changes his size to gargantuan, adds +8 Str, +4 Con, +4 natural armour, penalties to AC and attacks due to size, 2 feats, 5 skill points, and +1 to any ability score.
And if you want to make things even more difficult, why stop with heroes' feast? I had Raknian's pet wizard cast mage armour, resist energy, heroism, and stoneskin on Madtooth before the fight.
Turned out to be an easy fight for my players, because the party's warmage kept casting lesser orb of electricity, limiting Madtooth to only one action per round and the three melee warriors each had a frickin' freedom of movement spell. Oh well, I'll get 'em with Ilthane...

Paul Murray |

Turned out to be an easy fight for my players, because the party's warmage kept casting lesser orb of electricity, limiting Madtooth to only one action per round
One of my players is a Beguiler who has taken Ray of Dizziness as his extra spell. Ranged touch - causes pretty much anything serious to be one action per round. Madtooth could have 50 tentacles - wouldn't matter.
Why adding only 5 HD? the book says that
next question
If I pump it up from 20HD to 25HD to make it gargantuan, and it starts at CR 13, what CR will it wind up being? What will its space/reach be?

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You can always add more HD if you want a tougher opponent. I believe a 49 HD frogemoth is still gargantuan and should make for one memorable fight (CR 29). I don't have the Monster Manual in front of me, but I believe aberrations get +1 CR for every two extra HD and another +1 CR for the size increase.

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If I pump it up from 20HD to 25HD to make it gargantuan, and it starts at CR 13, what CR will it wind up being? What will its space/reach be?
Space and reach will go from 15/15 to 20/20, 40 with the tongue. BAB +3, Will Save +3, Fort/Ref +2, 5 skill points, 2 new feats, +8 str, +4 con, +4 natural armor, -2 AC, -2 attack. Tentacle and bite damage goes to 3d6, bite to 2d6.
CR goes up 1 for the size increase and either 1 or 2 for the hit dice (+1 per 4hd). I'm inclined to say give it the 5HD and call it CR 16 (give it the rounded-up value due to Raknian weighing the fight against them)