The Amazons

Polydora and The Amazons.
First appeared Season 2
Originally allied only to Artemis, they joined Fionn's Squad to help her avenge the murder of Apollo by Erebus.
Polydora had been blind for many years when she first met Fionn Corvin. She and The Amazons tested Fionn's fighting prowess extensively before agreeing to follow him in battle.
Fionn and The Amazons became close as family as Season 2 wore on.
Later they became his personal honour guard in The Tartarus War, never leaving his back unprotected for an instant.
When Fionn killed Erebus, Polydora's curse was lifted and she could see again.