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Asarashk had appeared out of nowhere to deal with Luck. His power and strength went beyond Arachne's wildest expectations. Not long ago, he was so pathetic that even the Tier 6 Monsters of the Swarm were a deadly threat against him. But against their expectations, Luck had grown in just a couple of days into a total monster.
The awakening of his Heroic Blessings and Powers might had been one, and also inheriting Elise's Magic and her Weapon too… However, the biggest factor that helped on his amazing growth was, without a doubt, the System Sylph gave to him.
Leveling Up by slaying monsters became his true blessing, capable of being able to "catch up" even if a little bit with the strongest of the younglings, such as Zack and Aquarina, gaining unprecedently amazing strength with each level, a process that would had taken months or years if done through the conventional ways a person grows their magic circle and develops their physique in this world.
Check "The Protagnist's Sister Is Actually the Strongest"!