i think the permanent invisibility ability makes you visible when attacking, then you set fade time to = time you want it to take to regain invisibility
Making a dummy unit cast invisibility spell on a unit will make it temporary until an action, just set the duration to 0. If thats what you meant, your question was kind of ambiguous.
yup permanent invisiblity will make ur unit visible when attacking
actually theres no "Data - fade time"
to make ur unit still invisible while attacking
change the
Stats - Duration Hero to 0
and
Stats - Duration Normal to 0
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.