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Here's what I remembered that hasn't been mentioned yet:
Gargoyles - ghouls
Basilisks - lizards
Gorgons - bulls
Wyvern - duck
Hydra - hydralisk
Gnolls - dogs, hyenas
Dryads - wooden sticks (dead dryads - a pile of logs)
Psychic elementals - hats
Phoenixes - welders
Blindness - flash
Hero Valeska - Valya
Hero Caitlin - Katya
Conflux - confa
Elemental - cop
Attack with Ancient Wonders - a white bear came and said "hi"
Taking something on the map when the guard of that something is standing incorrectly or when the guard was killed by another player - cheesing.