Flayer Slayer

Carvings of decapitated mind flayers adorn this greataxe's metal blade. You gain a +1 bonus to attack and damage rolls made with this greataxe. An Aberration hit with this greataxe takes an extra 1d12 slashing damage. If the Aberration is currently grappling a creature, the Aberration must succeed on a DC 15 Strength saving throw or release each creature it is grappling.

Heavy: Creatures that are Small or Tiny have disadvantage on attack rolls with heavy weapons. A heavy weapon's size and bulk make it too large for a Small or Tiny creature to use effectively.

Two-Handed: This weapon requires two hands to use. This property is relevant only when you attack with the weapon, not when you simply hold it.

Proficiency: martial, greataxe Source: Phandelver and Below: The Shattered Obelisk p. 217