Arcane
From MHWiki
The Arcane (used in reference to weapons) or Forgotten (used in reference to mice) power type is thus far exclusive to the Catacombs.
Description
Traps utilizing arcane damage come from sources shrouded in mystery. The strength of arcane damage increases proportionally against forgotten mice, making the traps especially effective in the Catacombs.
Effectiveness
Arcane traps are very effective against Forgotten Mice, namely:
Arcane traps can also catch Shadow and Physical mice without any bonus or penalty.
Arcane trap components
Currently, the only Arcane trap component available in the game is the Obelisk of Slumber weapon.