Power Word: Shield

7th-level abjuration

Casting Time: 1 reaction, which you take when a creature you can see is the target of an attack or spell
Range: 60 feet
Components: V
Duration: 1 round
Class: Bard, Cleric, Sorcerer, Wizard

With a word, a translucent shield bubbles out from a creature you can see within range. Until the end of its next turn, it is immune to all damage types except psychic, it has advantage on all saving throws, and all other power word spells have no effect on it. If the creature is poisoned, that condition is removed, and if the creature is aflame, the fires are extinguished.

Source: Heliana's Guide to Monster Hunting