[quote=@Zarkun]
<Snipped quote by Lugubrious>

The invisibility was more illusion magic, not it's own magic.
[/quote]

Not to mention, it was of sight only. He could be bumped into, sprayed with something, smelled, heard or any number of other ways of detection, now he can acount for a few of those, but that would reqire focus and time--useless in a stand up fight.