Most combat talents were changed, along with half of alchemy ones and a couple of the sign ones. Talents have been majorly overhauled and rebalanced. It does not regenerate while Quen is active.The lower the amount of available vigor, the lower the sign intensity stat is. It's used to cast signs and can be inceased by drinking certain potions. It is now a regenerative stat which gets drained when taking damage.
Vigor is what was previously named Adrenaline. Most monsters will require a steel sword to be dealt with (although silver works too), while Cursed creatures, Vampires and Specters will only take damage from silver blades. You can check the stats themselves and what they are influenced by in the character info sheet in your inventory.Ī silver sword is not needed for every monster anymore. These are all interconnected and have effects on regeneration rates, values and many other things.They also actively affect the gameplay, like having less health and stamina will make you attack and regenerate slower unless using certain potions. There are lots of new stats like attack and dodging speed, poise, adrenaline (not the same as before), vigor, etc.
Given that a consistent complaint about The Witcher 3 around here is the combat, I figured this might be of some interest.