"Sword Art Online Episode 19" can refer to multiple episodes depending on the specific series arc or adaptation. The primary episode 19 of the original series is titled

: While traveling through the Lugru Corridor, the duo is pursued by a Salamander tracer bat and eventually cornered by a large group of Salamander players.

: It is revealed that Sigurd , Leafa's former party leader, is conspiring with the Salamanders to disrupt a treaty between the Sylphs and Cait Siths . Other Episode 19 Variations

: To break through the enemy's shield formation, Kirito uses an advanced illusion spell to transform himself into a massive, demon-like creature resembling the Gleam Eyes from Aincrad.

This episode takes place within the and follows Kirito and Leafa as they travel through a cave toward the World Tree.