The Phantom 5

[Avaree]

Gravayard mobs
The spoon from orrick
The mushrooms or spiders from Arena

Just giving some ideas to help

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IMO Abo'Min won’t be in any maps above but maybe graveyard, arena was many expansions ago (and there already is child’s play there), and it appears that all the other phantom 5 bosses were present as the map was ran, not a spawn from a boss. Only other map(s) available for Phat5 would be forgotten ruins (less likely) , DM, or greensap, as in greensap when entering map there is already a few mobs present.