Shattered Sky Slash was the second BOSS skill Su Mu had acquired.
After killing three Skeleton Commanders, along with numerous Elite Skeletons under their command, Su Mu's pool of free stat points had already exceeded 20.
Before coming here, Su Mu spent 13 of those points to max out his second skill, Rift Slash, evolving it into a BOSS skill.
Shattered Sky Slash: Active Skill. An advanced form of Rift Slash. Cannot be upgraded. Consumes 1/20th of stamina. Releases a light blade in front of the caster, covering an area of 120. Deals damage equal to 2x normal attack to all enemies within the range. For each enemy killed, the light blade splits, dealing splash damage at half the previous blade's damage to nearby enemies.
Judging by the skill description, Shattered Sky Slash didn't seem significantly stronger than Rift Slash.
But!
What was a normal attack?
It meant a single strike executed with Su Mu's current strength and agility, paired with the sharpness of the Bone Falling Moon Blade!
Not to exaggerate, but at this stage, Su Mu could easily one-shot an Elite-tier Skeleton with a single slash.
And what was splash damage?
Just like now!
When Shattered Sky Slash was unleashed, a dark red light blade shot out instantly from the Bone Falling Moon Blade, slicing through the short distance between Su Mu and the Skeleton squad, and hitting the nearest Skeleton Archer.
As expected, this Advanced-tier Skeleton Archer was instantly killed.
At the same time, ten smaller dark red light blades splintered off in all directions—these were the splash damage blades!
That alone would already make the skill decent.
But!
After killing the first Skeleton Archer, the dark red blade continued forward, slashing down the second, third, and fourth Skeleton Archers along its path.
With each kill, the blade split again.
And those smaller blades (with 1x damage) that killed other Advanced Skeletons also split once more (0.5x damage)!
Each kill triggered another split.
This repeated endlessly.
Until all enemies within the attack range were wiped out, or the split blades could no longer kill—only then would the chain reaction stop!
That was terrifying.
Because theoretically, if Su Mu's initial strike was strong enough and the enemies were packed closely together, this attack could split indefinitely—slaughtering hundreds, thousands, or even tens of thousands of enemies in one go!
That was Shattered Sky Slash—a devastating skill for mass clearing!
...
On the castle wall.
With a single slash from Su Mu, countless thin, dark red light blades filled every inch of space within several dozen meters.
Under this dense and lethal barrage, the Skeleton squad didn't even last a full breath—they were all destroyed, reduced to broken bones scattered across the ground.
Without glancing at the corpses, Su Mu crouched low and used the inner side of the wall's battlements for cover, stealthily making his way to the other side of the wall.
Over there stood an arrow tower.
His first target—a Bone Sniper that had reached the Warrior Tier—was perched atop that tower!
The Skeleton squad on this stretch of the wall had already been cleared. No reinforcements would arrive soon. What Su Mu had to worry about was being spotted by squads patrolling the other three sides of the wall.
There were many powerful entities inside the Death Castle.
Just the Warrior Tier Skeletons numbered at least a dozen.
If any of them spotted Su Mu and raised the alarm, he would be swarmed by Elite Skeletons and Skeleton Warriors.
Even with two BOSS skills, Su Mu didn't believe he could escape unscathed from a siege led by several Bone Snipers, Dark Mages, Skeleton Sword Saints, and Erosion Wardens.
As for corpses…
Wasn't the ultimate essence of stealth just going berserk?
As long as he killed every Skeleton that saw him—no one would know he had infiltrated the Death Castle!
Bit by bit, Su Mu advanced.
He was rapidly approaching the arrow tower.
Once beneath it, he stopped, curling his body into a tight corner. From here, all it would take was a slight lean outward for him to see the Bone Sniper inside the tower.
Likewise, with a single charge, he could leap up the short stairway from this corner and strike the Bone Sniper from behind!
However…
He didn't act right away.
There were two things Su Mu had to be cautious of inside the Death Castle.
First, avoid alerting the Skeletons. If he was discovered, he would be overwhelmed by hordes of Skeleton Warriors, Elite Skeletons, and Advanced Skeletons.
Second, watch the Skeleton King's return timing.
Su Mu didn't know what kind of control the Skeleton King exercised over the Warrior Tier Skeletons.
If it was a suppression method like the Intimidation skill from Skeleton Battle Generals or the Shock skill from Skeleton Warriors, then even if Su Mu wiped out all the Skeletons in the castle, the Skeleton King wouldn't sense it.
In that case, only after the Bone Legion under Su Mu's command was wiped out would the King return.
But if it was something like Su Mu's own enslavement method, then killing any Warrior Tier Skeleton would immediately alert the Skeleton King to the invasion!
In that case, the King would race back to the castle to kill the intruder!
Su Mu wasn't willing to take that gamble.
So…
He waited.
Time ticked away, second by second. Su Mu stayed motionless in that corner, just like a lifeless corpse.
Finally—
After more than ten minutes had passed, a flood of system messages suddenly refreshed on his attribute panel.
At the same time—
Su Mu burst into motion!
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