should i upgrade my skill?

im hunting in orc barracks right now, and the footmen and sentinels go down in 2 hits with ss. (im nuker), and the higher level ones that are suppliers, skirmishers, they go down in 3 hits. so my question is, once i am 30 should i buy the new twister skill? because if it costs me more MP, but it still does not kill the mob in 2 hits, it would be a waste of MP, because then i could just leave my skill at this level right now and use less MP for it.

Skills work like this:

The lvl of Skill (nuke) VS the lvl of Mob.

So yes, you do need to always upgrade your skills.

higher level mobs will resist lower level spells much more often until the point you will do nearly no damage

higher level mobs will resist lower level spells much more often until the point you will do nearly no damage

which is why by the time a Necro hits 48, flame strike starts to fail just about every time.

but if his M atk is high enough, then he needs not worry about atm. he can keep going till hes moving on to harder mobs.

But he will need to familiarizer his MP pool, MP regen rate, and BtM rate with that of his skills and his up/down time.

If u can 2 shoot em instead of 3 depends on how much hp they have now left. if they have a measly thin line left sure u can 2 shoot em, but if they have like 20% left ...