Shadow
From MHWiki
"Shadow is a magical type of damage that is effective against ghostly breeds of mice."
The Shadow Power Type of weapons is necessary for catching most Mousoleum mice. The Sinister Portal, Ambrosial Portal and Bottomless Grave are currently the only weapons of this Power Type. They are very effective against the Ghost Mouse, Ravenous Zombie Mouse, Mummy Mouse, Vampire Mouse and the Lycan Mouse.
See also: