At will Command, Comprehend Languages, Counterspell, Find Steed(Bone horse, in actions)
3/Day Animate Dead(in actions), Creeping Rot, Misty step
1/day Death Ward, Soulhunt Scythe   Magic Resistance. The Undertaker has advantage on Saving Throws against spells and other magical effects.
Ferryman's Toll (3/month). The undertaker will stay dead until midnight when it reforms where it died. Once all uses of this ability have been used, the undertaker will remain dead until the next full moon at midnight.
Undead Fortitude. If damage reduces the undertaker to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken unless the damage is radiant or from a critical hit. On a success, the undertaker drops to 1 hit point instead.
Headless. A Dullahan's head is not permanently attached to its body and can be removed at will or will fall off if they crit fail a dex save. The head and body share one hp pool and AC level and always know where each other are. The body is considered blind with 15ft of blindsight but can perform a 30-minute meditation ritual to summon its head, as long as both are on the same plane.
Upon death the undertaker's body turns to dust. Drops: 88 silver each death, +2 Executioner's Sword upon the 3rd death, and Soul Mark Compass on the 6th death.