The Silver Mine
The bandit just took 15 Cold damage, and Yasmin's armor is reduced to 9 HP. Anyone who strikes her in melee while it remains still takes 15 damage.
"Fools, all of you," said Yasmin. She stepped clear of the melee-- let them attack her while she was vulnerable if they dared!-- and rained blasts of power down upon the bandits!
Eldritch Blast! 13 and 25 to hit; damage is 9 and 8 but the first one that hits does an additional 3 Bludgeoning, so damage is from 11-20.