Tildie has the ability to manifest her nightmares as real, monstrous entities.
After inadvertently killing her parents and a police officer, she was used as a test subject for a mutant "cure" and later taken hostage by Ord before she is rescued by the X-Men.
Tildie is a young mutant girl who inadvertently killed her parents and a police officer after her abilities first activated.
Afterwards, she is imprisoned in Benetech Labs and loses her abilities to Kavita Rao's mutant cure.
[1][2] Tildie possessed the ability to manifest her nightmares as red energy monsters.