One of the Arcane Traditions of a wizard is the School of Conjuration, which grants unique spell-like abilities.
Benign Transposition (PHB p.116)
Starting at 6th level, you can use your action to teleport up to 30 feet to an unoccupied space that you can see. Alternatively, you can choose a space within range that is occupied by a Small or Medium creature. If that creature is willing, you both teleport, swapping places. (…)
The description does not state what happens if the conjurer tries to swap places with an unwilling creature.
Does this mean that such an attempt is impossible?
Or does the unwilling target make a saving throw against the
If so, which saving throw would that be?
My guess would be a Wisdom Save against the wizard's Spell Save DC, even though this feature is technically not a spell (as I currently understand it).