Tsue to Tsurugi no Wistoria Season 2 EP23 - A Roar of Ice and Lightning

The moment Elfaria moves to accept Will into the ice faction, Zeo swoops in and steals him away. Elfaria erupts with rage, and suddenly the hall becomes a battleground for the two Magia Vander. Will awakens, bewildered by the fight revolving around him. The epic battle fought between two paragons of the world of magic escalates as they hurl their most powerful of spells at one another.