Minecraft Dungeons:Minecart

Minecarts are vehicles used by illagers to transport redstone, iron, diamonds and TNT found $$.

Behavior
Minecarts are usually seen dashing out of tunnels at speeds in rails and when they hit a player, they deal heavy damage upon contact. Minecarts also have a chance to appear with TNT in them and if it hits a player, they'll deal more damage upon contact.

Trivia

 * Despite being an object, they are still classified as mobs in the game files.

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