Mo-san ,You don't need muscle.

All you need is dragon blood to boost your mana then you can just use mana burst

Worth noting, that is Penth in a younger, underdeveloped state, not Penth in her prime. She deliberately manifests herself as such to avoid part of her Achilles trauma. In other words, she would probably be even more muscular were she to be summoned in the state she was in when she fought Achilles.

I completely approve of Penthesilea's swimsuit and summer look.

“ Achilles trauma” another painful reminder that the amazons were massive jobbers in Greek mythology

Penth starting to look more and more like Murakumo

I blame the artist as Mordred really should have more defined muscles.

Isn't she almost literally a Saber clone though? In which case, her strength comes from mana bursting, not her muscles.

I don't know the mechanics of this anime/game series, so I'm lost. Chicks with sick abs don't exactly do it for me anyway.