Monster Manual (5.5e)
Spellcasting. The cultist casts one of the following spells, using Wisdom as the spellcasting ability (spell save DC 15):
Multiattack. The cultist makes three attacks, using Elemental Flail or Elemental Claw in any combination.
Elemental Flail. Melee Attack Roll: +7, reach 5 ft. Hit: 25 (6d6 + 4) damage of a type chosen by the cultist: Acid, Cold, Fire, Lightning, or Thunder.
Elemental Claw. Ranged Attack Roll: +7, range 120 ft. Hit: 22 (4d10) damage of a type chosen by the cultist: Acid, Cold, Fire, Lightning, or Thunder. If the target is a Medium or smaller creature, the cultist moves the target up to 10 feet straight toward or away from itself.
Elemental Absorption (1/Day). Trigger: The cultist takes Acid, Cold, Fire, Lightning, or Thunder damage. Response: The cultist gives itself Resistance to that instance of damage and gains 10 Temporary Hit Points.
Any Climate; Any Terrain