pf2e.fyi
From Pathfinder Battlecry!, which isn't enabled.

Shift Horde

FEAT 12
ARCHETYPEMAGICALMANIPULATE
Activity 1 action
Archetype Necrologist
Prerequisites Necrologist Dedication
Frequency once per round
Requirements Your horde is raised.

With a wave of your hand, your risen undead horde collapses and another one rises to take its place. You Sustain your horde, dispersing the current group of undead and replacing them with a different type of undead to which you have access.

Pathfinder Battlecry!ORC