The Spider Mother

The strongest of the Ruined Tower. 

The Demonic Emperor. 

The Ruler of the Dead. 

Shiva had been called many fearsome titles during his tyrannical reign over the Tower in his past life. 

An apocalyptic force of necromantic power, in his prime none could stand against him...except for one rival.

A rival that matched Shiva's stride for stride and was almost as powerful as himself - the Supreme Summoner. 

He who held dominion over even the greatest of draconic species and possessed the ultimate power to summon spirits of King-level authority. The Supreme summoner was Shiva's lone equal on the field of battle, the only one capable of facing off against the relentless tide of his undead legions.

The Supreme Summoner had entered the Tower around the same time as Shiva in his previous life.