Mabaran Pact

You’ve pacted with a Mabaran shadow spirit, gaining a magical spectral greatsword (or maul) with a +2 bonus to attack and damage rolls, dealing damage of your choice (necrotic, cold, or fire). At 5th level, gain Thirsting Blade (extra attack with pact weapon). At 9th level, gain Lifedrinker (add Constitution modifier to pact weapon damage). At 13th level, gain Eldritch Smite (expend a use for +3d8 damage and knock prone, 8/day). At 17th level, gain Mabaran Mastery (crit on 19-20, add proficiency bonus to damage once/turn).