# Enemy
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Boos are ghost-like creatures that appear in the Mario franchise. They are typically found in dark areas, such as haunted houses and castles. A fanart Super Mario progress bar for YouTube with Mario Boo.
The Eye of Cthulhu is a pre-Hardmode boss in the sandbox game Terraria. It is a giant eyeball with a long, writhing body. A fanart Terraria progress bar for YouTube with Terraria Eye of Cthulhu.
The Reaper is a Hardmode enemy in Terraria. It is a large, flying enemy that resembles a skeleton in robes with a scythe in hand. A fanart Terraria progress bar for YouTube with Reaper.