Nice idea, but you might want to rethink some enemy names. The cyclops bosses, for instance. There might be a Greek monster you could rename them after, like say The Fates or The Furies? And in accordance with that you could have an additional effects appear as the debuff stacks as the three turrets focus on the players.
As for your five headed Hydra boss, it might also need a name change in addition to how it plays out. You could rename it to Scylla and maybe have a Charybdis pit to go along side it.
The final boss, while interesting, seems underwhelming unless you maybe have the aegis be needed to defeat it.
Just my thoughts.
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