They're bluish mutants and they can hit you fairly hard, but they're weak against your magic and sword just like typical soldiers would be. Along the way, you'll have to battle Drowner enemies. The arrow on the indicator will point you in the general direction that you need to go, so you shouldn't have much trouble navigating. Start forward through the well's lower level and you'll find that you're in an underground labyrinth of sorts. Tend to them, then investigate the well and you can descend to its lower level. You can smash down the wooden gate with magic, then proceed through it to find a few soldiers guarding a well. A soldier's corpse lies just to the side. Just past the cluster of villagers, there's a short alleyway with a wooden gate leading to the right. If you head forward, you'll find some villagers being held against a wall by some soldiers. If you descend from where the king is waiting at the gate, the alley splits off to the left or proceeds directly forward. Once you have tended to any side quests that interest you and looted houses for money and plants for herbs, you can find the secret well passage to proceed.

The witcher 2 to the temple