Skeleton Mage? With Multiple Casting, I'm an Undead Calamity

After transmigrating to a world much like Earth, Chen Mo triggered a special System called “Taking a Loss Is a Blessing.” Whenever he took a loss in a trade, he accumulated Blessing Points. Once he had enough, he could claim all kinds of rewards. On the day everyone awakened their classes, he actually traded his SSS-rank class for an unremarkable E-rank Skeleton Mage class belonging to a girl. While everyone else looked on in shock and confusion, he successfully gained a huge number of Blessing Points and received an above-SSS-rank reward: [Unlimited Talents]. [Unlimited Talents]: Every time you reach a level that is a multiple of 10, you gain a new above-SSS-rank talent. His first above-SSS-rank talent was [Multiple Casting], which let him freely spend multiples of his mana to increase the effects of his spells by the same amount. Skeleton Summoning has weak stats and a short duration? I’ll cast it a million times over, with a million times the numbers and a million times the stats. Every skeleton will be as mighty as a dragon bearing down on you! Life Drain has a long cooldown and absorbs too little, making it useless? I’ll cast it ten thousand times over and drain your health bar dry! The Skeleton Mage himself is too weak? Damage transfer is too low? With a hundredfold cast, 100% of the damage is transferred to my summons. What can you do to me now? And this was only his first above-SSS-rank talent.