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Signs are OP! Igni is OP! Alchemy is OP!
The thing is, not every build is viable at every level. Not only that, not every build is viable on every difficutly.
Anyone looking for an OP build at anything less than max level or endgame, just match your skills to the best set of witcher gear you have.
Griffin Gear is made for magic users, so a magic build is strongest once you have it.
-Igni/Quen dominates, even on Death March.
Cat gear is for fast, nimble attackers with crits and bleeds.
-Fast Attack/Fleet Footed/and maybe Resolve
Bear is best for strong attackers and synergizes well with alchemy.
-Search reddit for an alchemy guide, I'm not here yet in my game.
As the game progresses you gain access to each set and can upgrade the old if you find you like that play style the best. I advise swicthing to each as you get them rather than upgrading, and finding how you like to play. Or just switching when one play style gets boring.
Dont forget your armor skill bonus. It's worth the slot.
Last bit of advice: Remeber as you are leveling up that you have only a few skill slots and without them slotted, they dont affect you. Having three skill slots and spreading your skill points across fours skills is a waste.
EDIT: Wow, completely forgot about mutagens. You get a ton of blue early game, hinthint use more signs hinthint.
-Dont care what anyone says, Sun and Stars is useless.