
I am not 100% sure if I am comprehending this ability correctly.
How I think it was intended; You give the Thexa token to an enemy if able on one "end of any turn" phase, the token stays with that unit for a whole turn, and if Jorvan is still on the battlefield on the next "end of any turn" phase you inflict D3 mortals and return Thexa to Jorvan.
Assuming Jorvan survives the entire battle, you can potentially inflict mortals once per battle round and max 4 times per battle.
However the way it is worded I can see it being interpreted as "give Thexa to an enemy unit, do D3 mortals immediately, return Thexa." all in the same phase. essentially having the capability to do mortals twice as often.
Further to that, what would even be the point in even physically moving Thexa in the first place if it just comes back immediately...
I might be over analysing this, I'm pretty sure the former is the way it is intended to be played but I've been wrong about stuff like this before, and I've already seen people play it the latter.
How has everyone else been playing it?