billd91
Not your screen monkey (he/him)
The language may be similar... to a point. The issue here is warcaster isn't about targeting one creature, per se, it's about targeting THAT creature - the one who provoked the AoO. If you were to allow a split enchantment to work in this case, you're able to target a creature with your AoO that didn't do anything to provoke it. Considering warcaster's specific provision about targeting just the creature that provoked the AoO, going beyond that provision may be giving that feat an unanticipated degree of power.Yes but split enchantment uses similar language. It states when you "targets only one creature" (the one creature you can target with an AOO from Warcaster) you can target a second creature.
So if warcaster lets me cast a spell that targets "only that one creature" and Split invocation triggers any time I "target only one creature" then it would trigger on the Warcaster AOO.
This depends entirely on whether you consider these happen sequentially or not.
So, as far as rulings go, a DM might want to think about that one with some caution.