You have died and come back this gifts you heavenly, and not so heavenly, powers. 

Reborn fist

At third level you when you land an attack with a monk weapon you can spend one ki point to deal 2d(Martial die) of radiant or necrotic damage. This takes a bonus action.

Balanced Ki

At sixth level you manage to focus and balance your Ki. You gain resistance to necrotic and radiant damage.

Sight of the Gods

At eleventh level you gain the ability to see through illusions and falsities. You gain 120 ft of blindsight. 

Flame from Hell

At 17 level you can summon flames from hell. When you land an attack with a monk weapon you can spend 3 Ki points to consume the target in flames. They must make a Con saving throw and a fail die. And on a save take 8d12 fire damage. This punches through immunity and resistance to fire damage. This takes your bonus action.