Necrius
Skeletron Prime
After getting a squashling in wow and comparing it to Terraria one, I came to a conclusion that Terraria needs a walking bomb pet. Summon item will be sold by Demolitionist for 1 platinum during new moon phase after killing at least one mech boss. The summon item will be called "charred clockwork key" and will summon a small walking bomb with clockwork key and eyes.