Lillia

is a mysterious young mage and a former apprentice of Merlin. She is an original character made for Hikari to Yami no Grand Cross mobile game. She is the founder and leader of the Seven Disasters.

Apparence
Lillia is a young woman with light skin, dark purple eyes and short black hair.

After summoning absorbing the power of the "Ruler of the Storms", Lillia's eyes gets a lighter tone and her hair becomes longer and light blond.

History
Lilia was a former apprentice of Merlin, however, after enraging with her master, she left Merlin and started to learn magic by herself to, maybe one day, be able to surpass Merlin as a magician.

Times later, Lilia tried to summon an mysterious demonic entity called "The Ruler of the Storms"  in order to absorb it and become more powerful by sacrificing those she judged to be insignificant and unworthy of living, but ends up creating a portal connecting Britannia to a cave similar to Veldora's, where she summons Rimuru Tempest, confusing him with the demon she was looking for. In a failed attempt to convince the slime to fullfil her wish of the world's destruction and not having chance against Rimuru's powers, she escapes from him and directs to the place where the Ruler is.

There, after summoning the deceased Orcs defeated by Rimuru and his friends in the past, Lilia is able to absorb the demon's power and battle against the Sins and Rimuru.

After the battle, she returns to Britannia and continues her wave of murders, killing Holy Knights who hunted her. Some time later, wishing to have allies who share her ideology of destruction, she involuntarily summons a mysterious woman named Valenty and due to the similarities between their ideologies, they quickly become friends and after being able to escape a sudden attack of the Seven Deadly Sins with her new friend's help, Lilia decides to build her own group in order to achieve her goal to bring the disaster to Britannia titled as the "Seven Disasters".

Abilities and Equipment
Little is know about Lilia's magic powers, however, she seems to be powerful, since she was able to kill several Holy Knights to use them as sacrifice to summon her demonic powers. Like her former master, she also posses an magical orb called Spy's Eye used by her to channel most of her spells and presumably being the key when she decides to active her demonic powers.

After awakening the Ruler of the Storms' powers, she summons and controls a powerful black dragon she uses to cast her spells. Due to this transformation, her powers raises drastically to the point to resist the combined efforts of the pre-Commandments saga Seven Deadly Sins, Rimuru Tempest, Milim Nava and Benimaru.

Trivia

 * Merlin mentions in OVA 2 that magicians doesn't posses healing powers, however, Lilia is able to cast a healing spell named Eroica (エロイカ).
 * This can possibly state that she might be a Druid.