cicerno: My hero attacks a forest and finds 8 spiders. He is webbed, totally immobilized, for 26 turns before I just quit. Honestly, what is that supposed to be about? It would be different if the save function wasn't so unforgiving. But to give us so many stupid unwinnable battles and then penalize us for it is just obnoxious.
Just because one and the same tactic does not help against anyone, anywhere, does not makes that a "stupid unwinnable battle".
Spiders are dedicated warrior killers. You don't solo them, period. You bring buddies.
How is anyone supposed to level up a second hero? I just don't get it. Every encounter by then is impossible for him to win.
Leave the weak sites alone as your primary hero gets stronger. Seek him some harder challenges and leave the weak opposition behind as a future training ground for your second hero.