I found this in Wiki for shield mastery:
I found this in Wiki for shield mastery:
You should take all of them. The main use of Overpower is for shattering (critical) and for keeping enemies off balance (e.g. emissaries) but in any case the reduction in base damage is immaterial compared to the advantages that you get from Shield Mastery.
With Mastery and Expertise, all three defensive stances (Defence, Wall and Cover) offer exactly the same effective missile deflection. Shield Cover is totally redundant, drop it from your quickbar as soon as you have Shield Balance. By activating Shield Wall instead of Shield Defence you trade 5 defence for 5 armour and knockdown immunity. The wiki says that the damage penalty is pure fiction, which makes Shield Wall the best all-round choice. Activate and forget.
However, if you plan on switching between melee and ranged (e.g. for pulling an ogre) then it is better to activate SD a bit earlier, so that SW will already have cooled down when you have pricked your ogre and it is heading towards you. SD has an extremely fast cooldown but SW takes a while, and for facing the ogre you'll usually want SW instead of SD in case of a grab.
Just some thoughts.
I went for Overpower and Assault early on, did that tree and the Shield mastery tree ASAP. There are a fair amount of errors on the wikia and that was likely never updated as being fixed. i haven't had any problems with Overpower.
I think shield wall reduces your offense. It's usually better to leave it off unless you have shield expertise so you don't get knock down against some foes You need shield wall on. Like Dragons and Broodmothers. Things like that. I usually don't care about shield cover except at the beginning of the game. Maybe because I spam potions a lot. I get shield pummel and Overpower but Assault is a low priority but it seem to do a lot of damage.