Reckless. At the start of its turn, the berserker can gain advantage on all melee weapon attack rolls during that turn, but attack rolls against it have advantage until the start of its next turn.
Actions
Greataxe. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (1d12 + 3) slashing damage. Hailing from uncivilized lands, unpredictable berserkers come together in war parties and seek conflict wherever they can find it. .
Senses: passive Perception 10. Languages: any one language (usually Common). Speed: 30 ft..
RollQuest ships the D&D 2014 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.