In light of the recent Sorcerer nerf w/ Draconic Bloodline + Scorching ray I went in search of a damage boost. I figure Twinned Spell (PHB, p. 102) + Hex (PHB, p. 251) is a good combo.
(Note that Hex can only target a single creature at any level, so it should work with Twinned Spell.)
My plan is to target both on one guy when casting, then I spend two bonus action, over two turns, moving each Hex over to the BBEG.
Does this work? Can I move Twinned Hexes onto a single creature?
Addendum: What would the effects be of a Twinned Enhanced Ability, targeting different attributes given that spells don't stack.
Best Answer
This doesn't work
You can move two Hexes onto a single creature, but you shouldn't bother.
The problem is that Hex doesn't stack with itself — spells in general don't stack with themselves (PHB, p. 205). Since it's the same source, only the largest of the effects of the two Hexes apply to the BBEG. You might as well not bother, and move the extra Hex onto a different target.
(Note that you can't target the same creature with the original Twinned Hex, because a Twinned Spell requires a second target to work, per its description. But that's really a minor problem compared to the no-stacking issue.)