Even Lucifer's memory was altered and he didn't remembered this woman's face.
Though with his talent and ability to predict the world through human interactions and reactions he was able to deduce that his previous mother had sacrificed her existence for him. Though he didnt remembered her but his instincts and calculations made him sure that a woman like that existed thus at that very moment he broke causality in a small scale. Because of his beleif even if his memories etc missing his beleif alone allowed the woman to anchor to his conciousness and stay in the world.
Lucifer broke causality with beleif alone but he didnt knew that.
This was an irreversable process. Thus Lucifer did saved the omniverse but lost the only one who understood and loved him.
After that incident Lucifer went on a killing spree in his world and hence no one loved him to get close to him hence the cirse remained ineffective but now that he was reborn and his memories were reactivated the existential curse was now activated again.
This curse is the reason Alex would now try to save the people but remain unseen. Atleast that will be his plan.
Just as Lucifer became 10 years old the spirit started teaching him high grade spells like Fate magic, temporal magic, spacial magic etc.
After he mastered all the magic the world spirit revealed to Lucifer that the world and all life in omniverse was in danger and to save them Lucifer must grant death to his own world.
This was because the universes together form the Multiverse, Multiverses form worlds and multiple worlds placed in different places in the greater darkness known as the Greater Void. All of the worlds make up the Omniverse. Each world has its creator being but there existed a being which created this whole Omniverse. Though he balanced the world between good and evil, right and wrong thereby he also balance the omniverse with the void and its creatures. The omniverse expands and creates while the greater void and outers contract and destroy while absorbing.
The Greater Void houses the beings named Outers. They are primal beings with the soul purpise of destroying the omniverse and they cant be killed because they are a part of natural order. Normally the Void and Omniverse are divided by the Great World barrier which is normally expanding as life is alive in Omniverse but that time the world barrier opened just for one Outer to sneak into Lucifer's world.
Its target was clear any place in that world with life. As long as it could kill a single life it would gain the access to all the control of all the lives. This was how Outers cleared the omniverse when all life were to die.
But because the outer wasn't supposed to have had arrive there but it had somehow arrived there by being burnt by the World barrier. It made it sealed by the world barrier but the process would only last for 100 years.
In these hundred years the world trained Lucifer under different gods and all the worlds of omniverse provided him with the way to kill the outer so universe could peacefully expand.
The correct way to kill or send the outer back to its world was to simply use the universal energy a special energy developed by a santient world in its core to form a blade and stab the outer. Only the person who has merged with the universal core could touch an outer and push it out of omniverse back into the Greater Void.
But if someone taoes the Universal core of a universe then the alive inhabitants of that world would be wiped off of existence.
Lucifer didnt wanted them to be wiped them so a deal was made where Lucifer would kill and absorb all the souls and living matter into his body withing the next 100 years and upon his death that body could be used to reabsorb the sould and lives under the safety of Universal energy and then they would be allowed to be reborn.
But Lucifer wasn't allowed to tell abiut this to any other living being.
Hence forth Lucifer's lonely journey of slaughtering all living beings of his world began.
He acheived the target but at the end of it while absorbing and oushing the outer out of the omniberse Lucifer's body crumbled.
He had not expected to have transmigrated or to be reborn because according ti the damage done to him at that time even his soul should've been destroyed at that time.
As Alex retracts his memories he identifies this entity to be the world personification from his previous life.