some monsters are only found in certain districts. the chameleon (as well as things like goblin general, stump fighter and stump boss and such... i may have messed up the names a bit) are found only in forest. in the teens and 20's there's a few found only in the caverns. there are some monsters found only in mage district, some only in dark district, some only in fighter district, some only in graveyard, some only in swamps. there's even one found only in city centre and one found only in novice quarters. just depends on where you usually fight, or if you go all over larki.
--jason