Responses
Everything is possible WHEN there is the yellow dust. All their abilities and the monster abilities can be used or obtained when the dust exist. When the monster died, the yellow dust will dispersed and they will become normal again. So everything involving abilities have to be done when the dust exist.

i still dont understand how his gluttony ability works. i know that in order to get a certain rakshasa's power he needs to eat a part of them. but like when do those powers disappear? When he was using the mirror ability at chana's grandma's house, he mentioned he couldn't use it anymore because the rakshasas are dead. like does the power he obtained only disappear when the whole family of rakshasas are dead? or can he not use his previous abilities anymore, if he gained another one's power? IONT EVEN KNOW WHAT IM TALKING ABT