i havent tested it yet so i do not know if its posible..
It wil only work if you don't use orb effect's and if the spellbook allows it.
give every unit/hero that needs to use his mana as ammo a hidden spelbook with an autocast like searing arrow, make the mana cost 1 mana and set it on auto activate (or watever its called that it is always on)..
else you will have to trigger it..
it would be somyhing like:
event
-unit atacks
conditions
-attacking unit is equal to "your unit"
actions
set mana of trigering unit to mana of trigering unit -1
i cant acces WE at the moment so i woudnt know if teh trigger actualy work or are posible..
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.