That Time I Got Reincarnated as a Slime (2018)

S1E16 Demon Lord Milim Attacks

Under Rimuru's leadership, the Jura Tempest Federation has successfully allied with the Armed Nation of Dwargon. Just as Rimuru envisions a future filled with tranquility, he detects a massive surge of magical energy racing towards him at an astonishing velocity. Once the dust settles from the impact, a humanoid figure emerges: the Demon Mord Milim, the unique Dragonoid known as the "Destroyer." Ranga, Benimaru, and their companions quickly find themselves overpowered by her overwhelming strength.