Minecraft Dungeons:Chains

"Has a 30% chance to chain a cluster of mobs together and keep them bound for a short time [sic]"

- In-game description

"CHAINS – Has a good chance to chain a cluster of mobs together and keep them bound for a short time."

- Guide to Minecraft Dungeons: A Handbook for Heroes

Chains is an enchantment in Minecraft Dungeons. It grants a chance to bind mobs together with the intent of easier attacking. The duration the mobs are chained together increases with each tier.

Usage
Any melee weapon enchanted with Chains allows the hero to chains mobs together. Although chained mobs may still attack players in close proximity, they are rooted in place for the duration of the effect. The duration of the chains increases with each tier with the longest being 3 seconds before disappearing.