Mechanics
Starry Form: 2.2 minutes remaining
Owl Cloak Wings: 2 rounds
Protection from Evil and Good on Vrod: 4.3 minutes
Eithne will use her arrow attack on wretch 1 (whiff). Then she'll move to melee with the dredge and cast shocking grasp on it. That should take care of it's reactions if the spell lands. 12 lightning on the dredge and it can't take reactions until it's next turn.