Feign Death

3rd-Level Necromancy (Ritual)
Casting Time: 1 action
Range: Touch
Components: VSM (a pinch of graveyard dirt)
Duration: 1 hour

As in the Player's Handbook with the following added:

At Higher Levels. When you cast this spell using a spell slot of 5th or 6th level, the duration lasts up 24 hours. When you use a spell slot of 7th level or higher, the spell lasts up to 10 days.

Source: PHB 240

Changelog

Added upcasting option.