When it is pitch black, you are likely to be eaten by a Grue so be careful when exploring the dark! Grues are shadow elementals will teleport behind their target and drain health with their ghastly bite!
Normal, Crimson, Verdant
This creature can be summoned as a temporary minion by using a Soulgazer to add it to your Beastiary and then using a Summoning Staff to summon it.
Ender Pearls, Obsidian