War Plans and the Awkward Underworld Teleportation Array [Four Thousand Words]

What was even more terrifying was that all two thousand of them possessed Twin Martial Souls, along with purple Soul Rings at least five thousand years old.

They started at five thousand years—more than ten times the ideal age for an ordinary Soul Master's First Soul Ring!

The Year Limit Enhancement Method was excellent in every respect, and its leveling speed was certainly not slow.

However, two things constrained that speed: the realm of one's Spiritual Power and the strength of one's physique.

The amount of Spiritual Power determined the speed at which the Year Limit Enhancement Method could raise Soul Ring Years.

The strength of one's physique determined the exact number of years that could be raised at once, as well as how long one had to wait before safely using the Year Limit Enhancement Method again.

Not everyone was as formidable as the Undead Empire's high-level personnel, nor did everyone have the corresponding Heavenly Treasures and Soul Bones to aid their advancement.

Higher Soul Ring Years would naturally strengthen a Soul Master's body.

But if they were raised too much at once, without giving the body time to adapt, the body would explode like a balloon.

Ten thousand years ago, the first Twin Martial Soul Soul Master recorded in Douluo Continent's history had died after adding too many Soul Rings too quickly, causing his body to explode.

It was only later that Bibi Dong summarized the proper cultivation method for Twin Martial Souls.

In the traditional Soul Master System of Douluo Continent, only after reaching the Titled Douluo realm did one begin to value physical training.

Only above the Super Douluo realm would a tiny fraction of Soul Masters deliberately train their Spiritual Power.

Therefore, even though the Undead Empire had brought over more advanced and superior cultivation