Crimson Altar

The Altar of Crimson is a Pre-Hardmode Crimson-exclusive enemy. Once it spots the player, it will start lobbing blood clumps on them, which deal 40/ 80 damage. It has a 50% chance to drop a Crimson Ruby upon death.

It has a corruption variant, suprisingly called The Altar of Corruption.

Prior to v1.1, the altar had tesla turret ai and hence shot projectiles which could one-shot most pre-hm characters.