Project Brutality: Overboard - Seaside Siege
This is definitely my favorite map in the pack. From storming the fort from the beach to being stormed by an army of imps, there is never a dull moment.
This is certainly not a single attempt; there's simply too much going on with how Projet Brutality can break triggers and change the rules. I'm also not sure where the extra 9 monsters come from either since there's nothing spawned initially on the map that can summon them, which is why I missed one despite looking for it. The only things I know of other than all the Pain Elemental variants that spawn extra monsters are the Ice Vile that summons Ice Imps and the Infernal Cacodemons that spawn baby versions of themselves.
Overboard: https://www.doomworld.com/forum/topic/130657
HeXeReTiC HUD: https://brutalrepository.pl/index.php/downloads/project-brutality/hud/download/4-hud/9-hexeretic-hud
Project Brutality: https://github.com/pa1nki113r/Project_Brutality
Simple HUD Addons: https://forum.zdoom.org/viewtopic.php?t=60356
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