Where did you find the trap spell?

[gerokee]

I'm almost through all islands, Uzala I haven't yet discovered, and I'm still missing the trap spell. In the first King's Bounty game, that spell was an integral part of my battle strategy, so I'm not exactly exhilarated at being still on the hunt for it - especially as there's a nice medal to be earned with it.

So where have you guys found the spell, maybe I missed it somewhere? I'm aware that the games differ a lot, but in the first game there were some patterns, so your experience might still point me towards it.