You bind not only your soul to allow for an unbreakable bond but you can bond your undead into a stronger undead.
Combine your undeads together adding there cr to create a stronger cr undead. For example combine 4 skeletons cr 1/4 to create a cr 1 undead creature.
As long as you are bonded with that one undead you can expend 1 spell slot lvl 1 to half all damage you take and he will take the other half. This ability lasts 1 hour and can be used as a reaction.
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