MapleStory thief revamp. What do you prefer?

Night lord:
"nighttime": Makes the map turn to nighttime (like evans dark fog). While nighttime, dmg taken -50% for all party members, +100% dmg for nightlords and shadowers.

Shadowers:
"inversion": Inverses light to be shadow. Same effect as nighttime. :I

At max 1 min duration, 3 min CD.
3 NL/shad = constant dmg x2 though lulz

The map getting dark skill is something I would never have come up with.
I love the idea of the map getting darker and that party members or just the person who's casting it gets a buff.

EDIT: What about some charge up skill? Any ideas of what this could be linked to?