Flesh and blood of a mortal, destined to become a handful of dirt in a hundred years.
Fortunately, slaying demons lets him plunder their lifespans for his own use. He can spend those years to improve his martial arts, summon and train powerful heroic spirits...
(Red Blood Sword Art) breaks through to (Blood Prison Blazing Sword), (Demon-Subduing Dragon Claw) breaks through to (Dragon Emperor Demon-Hunting Hand)...
With enough demon lifespan, he can summon loyal heroic spirits of the human race to fight alongside him.
The first: Zhao Yun, Zhao Zilong!
The second... the third...
Before long, the more lifespan he spends, the more he ends up with...
Until one day, even the lofty gods and demons of the myriad heavens are stirred by Liang Xiao.
Then let the blood of these gods and demons of the myriad heavens prove my path to immortality!
It's okay, you have dozens of fucking summoned characters, just one.
I can only say it's useless. After hundreds of years, nothing works. It's so overwhelming.