Here’s the translation of your Chinese text into British English (UK), with “—” replaced by commas, and “Mahayana realm” used where applicable. The tone remains natural and true to the original, highlighting Lin Yun’s power-up and bold return:
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The Ten-Thousand-Year Immortal Fate Grass was a treasure even Tribulation cultivators would kill for.
Using it for third-rank Mahayana was a poor trade, that leap could come from spirit crystals with time.
Lin Yun’s old plan relied on crystals for that.
After checking his stash, he made up his mind.
“Time for these beast cores to shine.”
He pulled out twelve!
In the Demonic Beast Mountain Range, he’d slain thousands, their bodies stored in the Green Vine Gourd space.
These twelve cores, from Mahayana-tier beasts, were the rarest of his haul.
He swallowed the first.
A surge of raw, domineering energy flooded him, purified by his meridians, pouring into his dantian sea.
The sea swelled, its inner energy spinning like a vortex in raging rapids.
Half a day later, he took the second.
Then third, fourth…
By the eleventh, his dantian, gorged on energy, hit its limit—like a millennium-pent volcano erupting!
The burst flooded his body, seeping into muscles, bones, skin, organs…
Every inch of him surged with power!
An hour later, it settled.
Lin Yun opened his eyes, grinning.
“Third-rank Mahayana, done!”
“Ha, brilliant!”
He laughed heartily, the realm jump invigorating body and soul, energy brimming like it’d burst!
He raised a hand, inner energy swirling.
It felt leagues beyond second-rank!
Realm boosts were the starkest power spikes—crossing one often took every trick, showing the gap’s size!
Six days total, thanks to premium beast cores, spirit crystals would’ve taken far longer.
Outside the One Thought Clarity Tower, just over a day passed.
“I’ve got a strong edge now, but it’s not enough! I need a sure win!” he muttered.
“Third-rank Mahayana, time to try Heaven-Shaking Hand’s second turn!” he thought.
At third-rank Empty Nether, he’d mastered the first, now he felt ready for the second!
He began condensing it.
Four days later.
His palm turned pitch-black, scaled over.
“Go!”
He clawed, space ahead shattering!
“Second turn, nailed!” He smiled.
Its power dwarfed the first.
With it mastered, confidence swelled.
Heaven-Shaking Hand demanded insane body and arm strength—too weak, and it’d fail, but meet the mark, and it flowed naturally.
Getting the manual was the real trick.
Post-mastery, he didn’t rush out, charging his bracer, restoring peak condition.
All set, he stood.
“Elder Yin, I’m back!”
His lips curled, dark eyes blazing, ready to torch all in sight!
He exited the tower, left the cave, and bolted for the ravine!
Ten days inside, two outside.
…
Ravine depths.
“Elder Yin, here!”
Several Tiansha disciples led him and twenty-odd others behind a boulder.
In its crevice grew a translucent plant, glinting like diamonds in the sun, utterly unique.
The Fire-Repelling Spirit Grass!
“Didn’t expect it in such a hidden spot, took ages, but found it!” Elder Yin eyed it, greed glinting.
He reached to pluck it.
“Old dog!”
A sharp, commanding shout exploded, piercing the air.
“Who!”
Elder Yin and the disciples whirled.
A lean young figure hovered high, chest out, gazing down with world-defying swagger.
Lin Yun!
“You!”
Elder Yin’s face twisted at the sight.
“Got some guts, eh? Escaped last time, now you’re back? Mocking me?” he barked.
“Back for my Holy Spirit-grade artifact, and that Fire-Repelling Spirit Grass is mine too! Hand them over, and I’ll spare you,” Lin Yun’s voice boomed like a bell.
The Tiansha group blanched.
They couldn’t dream he’d dare say that.
“Kid, you… what arrogance! Think I’m a pushover? If I don’t kill you today, I’ll quit cultivating!” Elder Yin roared, livid.
Lin Yun’s words were the ultimate insult!
He drew his black spear—a Holy Spirit-grade weapon fit for a Tribulation master.
“You’re dead this time!”
The spear stretched into a thirty-meter mist, inner energy surging, fully channeled.
He’d fought Lin Yun before, knew his tricks.
No holding back—full power, all techniques, poured into the spear.
It struck like a dragon from the deep, matching the might that beat Lin Yun last time, blasting toward him!
“Here we go!”
“Holy Light Extinction!”
Lin Yun’s dark eyes flared with battle lust, world energy rushing to him.
His third-rank Mahayana aura burst free.
“Third-rank Mahayana now? Still no match for Tribulation!” Elder Yin’s eyes surged with chill.
“We’ll see!” Lin Yun smirked.
“Heaven-Shaking Hand, Second Turn!”
His palm blackened, scales creeping over, eerie and wild.
He struck!
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Let me know if you’d like to expand or tweak! Lin Yun’s power-up and brash return set up an epic rematch—second turn’s debut is clutch!