About Nebulite skills

Are there cd for those skills?
Also, for skill level +1, can they exceed the master level? (the one I got from leafre codex set effect cant exceed the master level!! )
Can I equip skill level +1 not on my hat? I got 2% int on my hat already.

Thanks.

No cooldown on nebulite decent skills. I've never seen a +1 skill level neb, but I'm sure it wouldn't work past max level, as far as I know, only combat orders does that.
But hey, I haven't played seriously for a long time, maybe they changed stuff like that?