This season of
Slayers is about the destruction of the
Ancient Dragon race in the
War of the Monsters' Fall and
Valgarv, an Ancient Dragon made half
Mazoku by
Gaav. Valgarv wants to destroy the
Golden Dragons, and in the meantime, beings from another universe (ikai hito, meaning other-worldly people and
squid people at the same time, leading to several squid jokes throughout the series) are trying to summon the Dark Lord
Darkstar into the Slayers Universe to keep him from destroying their own.
Of course, in the midst of all of this,
Lina Inverse is forced to help because a human is mentioned in the prophecy, and her more powerful sister,
Luna Inverse, turned
Filia down when she asked for help.
Filia turned to Lina instead, and Luna forced Lina to help with a threatening letter which scared Lina so much that she built a
pyramid and buried herself in a
sarcophagus to try to hide.