Minecraft Dungeons:Frenzied

"While you are at less than half health, your attack speed is increased."

- In-game description

"FRENZIED – While you are at less than half health, your attack speed is increased, do you can take out mobs faster."

- Guide to Minecraft Dungeons: A Handbook for Heroes

Frenzied is an enchantment in Minecraft Dungeons that increases the attack speed of the player when their health drops below half. The amount the attack speed increases goes up with each tier.