Your Curses can apply to Hexproof Enemies 
Profane Bloom is a notable Ascendancy passive skill for the Occultist. It allows your curses to apply on Hexproof enemies and gives cursed enemies a chance to explode when killed by you or your minions, dealing chaos damage in an area.
Physical Damage: (67.2-74.4)–(166.8-181.2)
Critical Strike Chance: (8.82%-9.24%)
Attacks per Second: 1.20
Weapon Range: 120Requires Level 56, 179 Int(31-35)% increased Spell DamageAdds (24-30) to (80-92) Physical Damage
(26-32)% increased Critical Strike Chance
Gain (13-15)% of Physical Damage as Extra Chaos Damage
Enemies you Kill have a 20% chance to Explode, dealing a quarter of their maximum Life as Chaos DamageWe forge order from the world around us
Wielding anarchy and destruction as our tools of genesis. unique wand gives an additional 20% chance for enemies you kill to explode. It does not increase the damage from explosions.