
AbsolutGrndZer0 |

I thought of this feat idea, so wanted to run it across you guys, see what you all think.
Twin-Souled Sibling
Prerequisite: Character level 1st, Must have a twin (fraternal or identical) sibling who also takes this feat.
Benefit: You gain a permanent Telepathic Bond (as the spell) with your sibling and all targeted spells, beneficial or harmful, cast on you affects your sibling also as if she were the primary target. Any time you take lethal damage, your sibling receives an equal amount of nonlethal.
Special: If both you and your sibling have lethal damage and receive magical healing of any kind, only the sibling who has taken the most lethal damage is healed of lethal, but the equivalent nonlethal heals on the other sibling.

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It's an interesting take on the twins approach, and I appreciate that you're aiming to balance things out with the shared nonlethal damage. When I first saw this thread's title, I started thinking of the Kin Guardian combat trait in Ultimate Campaign.
You're going to find this feat can be fun for some home game situations, but in a broader context, it presents some potentially disruptive consequences. For example, personal spells are balanced at least in small part by their not being applicable to other party members. This doesn't seem like a big deal until Wizard and Monk the twins begin adventuring together, and Wizard (or even Mystic Theurge) casts a bunch of personal spells "never intended" to go on a monk at full power. I'm using quotes there just because there are always workarounds and exceptions, but I believe the basic concept is fair.
Consider if it were Cleric and Barbarian instead. Sure, Cleric takes some nonlethal damage every time his brother Barbarian (benefiting from divine favor, righteous might, and/or divine power) takes damage, but by channeling positive energy, he clears up his own damage and that of his twin. Again, this might be what you're intending, but I'm seeing it as a take that might cause you (or the GM, if that's not you) grief.
The Special entry is rather confusing and might be a little weird to handle in actual gameplay. I think it's to prevent the target sharing feature from healing both equally?
Consider giving the telepathic bond feature a fairly short range like 30 feet or being adjacent. That seems to me that it might better reflect an empathic bond and ability to read body language, unless the goal is really to have the twins inside each other's heads.

Kazaan |
Maybe Empathic Bond of unlimited range (you can tell when your sibling is happy, sad, angry, etc but not specific conscious thoughts) and Telepathic bond at limited range. This gives them circumstantial bonuses to various actions because they can triangulate for attacks, see from two different points of view, fine-tune their lies, etc. I think it'd be reasonable to say that any attack rolls they make get +1 when they are in Telepathic range as well as any Perception, Bluff, Diplomacy, or Intimidate checks. They gain an extra +1 when flanking together. I'd say give them +2 to will saves (2 minds share the brunt of mental assaults) which goes up to +4 when they are close enough for the Telepathic Bond. Ditch the shared spell effect/healing and, instead, make it so, if they are adjacent (where the Telepathic bond is strongest), they can both roll for any d20 roll and take the better of the two results.
To balance all this out, if one is staggered or unconscious, they suffer -2 to their attack rolls, the aforementioned skills, and their Will saves. If one dies, the other suffers a permanent negative level and the above penalties increase to -3.

Castarr4 |

Corner cases:
They both have equal amounts of lethal damage and one receives magical healing. Who gets healed what?
A cleric channels and affects both siblings with it. What happens in the case of one being more damaged by a lot? By 1 hp? Equal hp?
Is there a range limit? What happens if one dies?
What if one sibling is immune to an effect, such as an attempted death spell on someone with death ward. Is their sibling still affected?
What about a spell such as Beast Shape where you choose a form? Does each sibling get to choose a separate form?
Does this affect supernatural or spell-like abilities (witch hexes, potions, wands, etc.)?

AbsolutGrndZer0 |

Hmm, yeah I didn't think about stuff like polymorph and stuff, that's not intended... mostly it's healing or like Charm and such. If you Charm one sibling, both must make the saving throw. Mage armor, etc. Maybe exclude transmutation spells? Id have to take a closer look.
As for the healing thing, if if a fighter has 25 HP and 5 damage and a cleric has 15 HP and 5 damage then the cleric has more damage, because it's a higher percentage of her total HP, at least that's how I'd rule it.
As for all the "corner cases" from Castarr4, pretty much treat it as "share spells" that familiars get, but also applies to things others cast on them (so yes Su and Sp, anything that is targeted), with the additional thing to prevent one healing spell working on them both and doubling up the healing. Which, while that can be powerful for stuff like Mage armor on a monk, it IMO is balanced that yes, both siblings will have to make a save vs. a death effect.
As for what happens if one dies, I actually like Kazaan's ideas of a negative level, and such.
Finally, as for the telepathic bond, the original concept and such is pretty much yes, they are for the most part in each other's heads. In a way, they are so connected because they are one soul that split into two.

AbsolutGrndZer0 |

I came up with a better way to handle healing spells, and wanted to see what was thought of it by others.
First any lethal damage on the twin targeted is healed (which then heals the corresponding nonlethal on the other twin), and then any excess healing (if any) is then transferred to the other twin. The drawback comes if say Twin #1 has 30 HP and Twin #2 has 50 HP. Twin #2 takes a big hit of 35 lethal. She's fine, but her sister just went down, 30 nonlethal and 5 lethal. So, Twin #1 is now unconscious. If she's the healer, they're both screwed. Also, the same casting or channeling can't "double up". So, like if in the above example a cleric channeled and healed Twin #2 of 15 HP and then also healed Twin #1 of 15 HP, that extra 10 lethal healing is lost, it does NOT transfer.
As for the shared spells, for the most part it does mean that one casting of things like Guidance and such affects them both, but I feel that is balanced in that if they are victim to say Charm Person or a witch's Evil Eye hex, they both are affected and must make a saving throw (and for purposes of Evil Eye and similar "one use per person in 24 hours" caveats, only the twin specifically targeted counts for being able to use the hex again!) Then as for transmuation, I think the spellcaster makes all decisions but only once. So, if Beast Shape III is used to turn into a wolf, then both twins become a wolf.
Plus, imagine a fireball hitting them both... say you roll 35 damage to each of them, then that means another 35 nonlethal on top of that? Not pretty. Not pretty AT ALL.