Essence of Rage

This swirling potion tastes like iron and bitter raisins. When you drink this potion, you enter a rage that lasts for 1 minute or until you’re knocked unconscious. This rage grants you the same effects as the barbarian’s class feature at 1st level with the following additional properties:

If you end your turn without having attacked a hostile creature or taken damage since your last turn, your rage does not end, but you take 1d4 psychic damage instead.

You can enter this rage even if you’re wearing heavy armor.

In addition, when you use your action to drink this potion, you can make one weapon attack as a bonus action.