Welcome to Camp Caelum, a camp hidden by fog and clouds. Humans cannot reach this camp, for it is only for mythical beings, such as Demigods and Hybrids. If a human shall enter the camp boundaries, the fog will decide their fate. (Caelum means Sky in Latin.)

Basically what the title says :3

undertale is a game that's popular <spoilers> these are the main character frisk chara flowey / omega flowey / asriel (normal/god of hyperdeath/angel of death) toriel asgore sans papyrus alphys undyne mettaton (normal/EX/NEO) 3 modes : pacifist neutral genocide

Read. The. Title.

Rules: none! Join!!