Gentle Repose

From Player's Handbook, page 245.

Description
2nd-level necromancy (ritual)


 * Casting Time: 1 action
 * Range: Touch
 * Components: V, S, M (a pinch of salt and one copper piece placed on each of the corpse's eyes, which must remain there for the duration)
 * Duration: 10 days

You touch a corpse or other remains. For the duration, the target is protected from decay and can't become undead.

The spell also effectively extends the time limit on raising the target from the dead, since days spent under the influence of this spell don't count against the time limit of spells such as Raise Dead.

Learned By

 * Classes: Cleric, Paladin (OCF), Wizard
 * Subclasses: Druid (Circle of Spores), Fighter (Eldritch Knight), Rogue (Arcane Trickster), Sorcerer (Divine Soul)