Hi i have a question regardin exclusive skill. In they description it is say that only one exclusive skill can be active at any one time… but is this a restriction about the mestry itself or the wole game? I meen some maestry have two different exclusive skill, other one or no one. If too maestry has bot exclusive skill, can i use one from bot at the same time or only one?
Only one. You can max every exclusive skill you have but only one can be in effect at a time.
It’s a character design choice.
only one, so pick one that supports your build the most
So this ultimate skill are pretty much less apetible. If i pick necromancer + shaman at level 50 on both skill tree i will have more or less 6 active skill but only 3 usable at time. The other have to stay down because i cant activete them. For this reason for me it will be pointless to invest in shaman (or necromancer) till level 50. I can spare 10 point if the skill cant be used. If i chose necromancer i will pick maybe master over death and leave aside level 50 shaman because i want spend to much poin for pick only one skill.
well if u need those points for “other skills” ofc, no sense to reach 50/50 for just some extra stats… just don’t go under 32, else u will feel the difference in stats 
(making % bonus on AO/DA/HP less effective by default, btw always depend on gear/build/etc).
still, unique skill are like that for a reason… going around with primal bond + possession is illegal in some states! Also star pact + reckless power (and many other combo prolly), so is all for the best.