For this one....i have to answer from my point of view as a hunter and the best folio for me is
Thrill of the hunt Folio which gives shadow the spell for
Thrill of the Hunt
Reasons : Since i am a hunter and my shadow is BC built, i mostly use my shadow to hunt...
The thrill of the hunt spell has Effect like a Weak Elixir of Power but instead of 37%, its just 25%.....And it only works against monsters...
On the bright side, the Effect last for 10 turns, so when it is activated, my shadow can hit in 10 turns with extra damage and possible of power crit due to the BC built, and instead of the
Shadow Power which can be used many times but the interval expectation is unpredictable eventhough the the damage increase is even higher(40%) than Thrill of the Hunt (25%). Thrill of the hunt have better power crit chances than Shadow Power's power crit.
On the not so bright side, the spell is one time used, so....when used at wrong time it will end up badly
Why i like this Spell as the best
Easy hunt, easy shadow quest (for 5 kills and upgraded quest for not making more damage than shadow), and also good for picking (those scorpions and gargoyles dont leave me alone in peace from time to time).
That is all my say about best shadow spell to me...