Innate Divine Strength, fierce in battle, and when fighting as a team, she would sometimes enter berserk mode for a short time to coordinate with her teammates.
In berserk mode, Illya's combat power would soar, even surpassing that of a hero for a brief period.
She was a born warrior. After her death, the Heroic Spirit Hall valued her, so her becoming a heroic spirit was only natural.
Natural... but also not natural.
Amelia wasn't a Spirit Summoner; she couldn't summon Illya.
He was, though, and had summoned Heroic Spirits multiple times, yet Illya never once responded to his summons.
The most eager to answer his summons was the Fantasy Heroic Spirit, Flame Queen Helen, with her cool entrance and catchphrase, "Lance, save me."
Given that Illya was a Heroic Spirit, why hadn't he ever summoned her even once?
I understand now.
She looked down on him as a Spirit Summoner.
With Illya's combat strength, she had the right to choose her Spirit Summoner.