Challenge Assistance

Complete each of the following Encounters.

Defeat all three members of the Undead Trio in a Graveyard Map within 3 seconds of each other.
Defeat Hephaeus, The Hammer in a Chateau Map while it is Enraged.
Defeat Shock and Horror in a Mineral Pools Map while it has at least 10 Lightning Warp Totems active.
Defeat the Beast of the Pits in a Barrows Map while it is Vulnerable.