Who, ME?

You cannot be seen or heard by anyone other than Curse Sorcerers and other Cursed Spirits
Non-Curse Sorcerers whose lives are put in danger by a Cursed Spirits may gain the ability to see it in that life or death situation
Invisible Force: You are entirely made out of Cursed Energy, meaning you cannot be seen by normal people

Things that can see you

Other Cursed Spirits
Curse Sorcerers
Celestials
Creature who have less than 10% of their Max HP
Creatures that can see Spirits
Undeads [REALLY HIGH LEVEL ONES ONLY]