Homebrew
Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Small humanoid. The swarm can't regain hit points or gain temporary hit points.
Slam. Meele Attack Roll: + spellcasting modifier, reach 0 ft., one target in the swarm's space Hit: (2d4 + wisdom modifier) slashing damage or (1d4 + wisdom modifier) if the swarm is bloodied.
Overwhelm. When you have at least 6 undead minions you may command them as a bonus action to rush and overwhelm a 10-feet wide circle area. All creatures within that area must succeed at Dexterity saving throw against your spell casting DC or suffer 3dX damage (where X is the current dice of Raise minion damage) + your wisdom modifier. On success creatures suffer half damage.
Each raised corpse adds 10 maximum hit points to the swarm up to 12 minions (and therefore 120 hit points)
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