Originally Posted by ToddMcF2002 
I upgraded Aard and now I wish I hadnt. The Endurance cost has gone through the roof. Where I could use it 2 or 3 times in protracted combat before without a potion now I can use it once.
Guess its time to churn out tons of potions.
And plan your next upgrades. It's possible both to decrease the Endurance cost, increase your Endurance, and increase the speed at which it regenerates. Remember: a well-round Witcher is an effective Witcher…