Fulfill the special conditions to unlock these "E" (Extra Rare) cards. You may only unlock one of each E card per profile.

Card	How to unlock
Bistair	Obtain at least one of each fire creature card except E cards.
Blade of Culdra	Replay Stairway to the Gods as a past stage in story mode.
Flammefleur	Complete the second trial Kaningun in story mode.
Fontaciel	Complete the first trial Venice in story mode.
Iksear	Obtain at least one of each water creature card except E cards.
Leoknight	Replay Cravonia as a past stage in story mode.
Nil	Replay Lalasati as a past stage in story mode.
Rouetsoleil	Complete the third trial Provedin in story mode.
Selenear	Obtain at least one of each earth creature card except E cards.
Terrair	Obtain at least one of each wind creature card except E cards.
Zeromn	Obtain at least one of each card except E cards.