Eren had dipped his hands into the sword's wraith's stomach through the wound he had created and executed his newly gained ability. Since the wraith didn't have any vitality, all he could extract was the wraith's mana.
Since he couldn't channel the dark blue mana through his mana core even though it had become compatible with his mana circuits, Eren couldn't use it the way he wanted.
The most he could do was release all the deposited dark blue mana in his mana circuits through his hands in one go– as if expelling it. That's what he did right afterwards.
Kachaaaaa!
The elf wraith's rib bones broke and produced a sound when the dark blue ice suddenly flooded his insides. The origin of that deposition was Eren's hands of course.
Eren didn't try to control the mysterious mana in any way. As a result, the deposition of ice that had suddenly taken place inside the wraith's stomach didn't have any fixed shape. It just started expanding inside the wraith's body– expelling everything that stood in its way after freezing them solid.
The formation of ice started spreading on the wraith's body from the outside as well. Eren had released all the previously accumulated dark blue mana as well as the mana he had just absorbed from the sword wraith all in one go. That too without worrying about casting any spells. So the rate of ice formation was rapid.
The attack turned the sword wraith into an ice statue. The swing of his sword remained incomplete just a few inches away from Eren's neck. His sword didn't have any dark blue mana radiance.
"Timber!"
After pushing the frozen statue of the wraith by his shoulder, Eren spoke aloud. It fell on its back and broke into multiple pieces shortly afterwards. The sword wraith had been successfully taken care of.
"Screeeeeee!"
An apparition of the sword wraith emerged from its corpse, which had been broken into several pieces. It screeched and ran straight towards its opponent.
The butcher had learned his lesson from last time. He was already departed from his previous place before the sword wraith laid eyes on him. With his movement speed in full effect, he approached the sword wraith's apparition from its left side and used his lightning spell on it:
"Blitz Bolt!"
Eren used his lightning element offensive spell to attack the apparition. It was busy screeching at his previous place, so it was caught unaware.
"I wonder…"
Eren had a wild thought and used his newly gained spell on the apparition's spectral form by touching it:
"Life Drain!"
The apparition started fading down as soon as Life Drain was used on it. The butcher smiled joyously after seeing the spell's effects on the apparitions.
'So that's what happened to the old hag. I do not know what this spell will do to the apparitions or how it will affect me. But for now, this will be useful to take care of these damn wraiths.'
Eren then took his time and used his spells in moderation to take care of all the wraiths. The fire snakes prevented the wraiths from ganging upon him. Plus, by now, he had found a pattern to take care of the monsters in an efficient way.
First, he cast fire spells on the wraiths. Then he would follow it up by using Life Drain on them. He would then use the dark blue mana he had gained to freeze and destroy the wraiths' bodies.
Eren would then plan his lightning element attacks on the wraiths' spectral forms just enough to slow them down. Lastly, he would use Life Drain on their spectral bodies and make them disappear.
Eren had also started using Renar's crocodile skin spell to protect himself against the wraiths' attacks. His skin would get sore and his headache would return every once in a while as a side effect of shifting between so many irregular spells. But he suppressed the feeling of frustration mixed with annoyance and marched on.
The plan he had concocted to farm-kill the wraith was easy on Eren's mana consumption as well. He would only have to expend it on his lightning element spells. The rest of his attacks were based on his use of Life Drain and stealing Dark Blue mana from the wraiths to use against them.
The battle continued for hours on end. There were only a few wraiths left by now. And they had already slowed down. Eren checked on his condition while taking a breather as he watched his remaining opponents with vigilance.
He was about to run towards the nearest wraith and begin killing the remaining wraiths as well. But just then, he heard the wraith's screech in unison. Their bodies started exuding smoke while they started running in the opposite direction from rain– as if they were looking for something.
Only then did Eren realize that the sky was not pitch black anymore. Even though he couldn't see the sun, the first rays of dawn had hit the wraiths. Contact with the sunlight caused the wraiths' bodies to exude that smoke. Their bodies were disintegrating.
The wraiths couldn't run long enough. And it was not like the barren place had any shade they could use to hide under. Soon, their corpses were disintegrated and their apparitions were forced to come out. Those forms too couldn't last much in the daylight– fading away.
"Haah!"
Eren took a long breath after his fight with the wraith was officially over. He was almost going to die in the battle if he hadn't gained the Life Drain from his fight with the old hag.
But now with the newfound strategy, Eren could finish the wraiths off if he was made to fight them again. His survival in the solo tower for seven days was going to be relatively easy at this point.
Or so he thought.
"Hahaha! Would you look at that relaxing face? I'll enjoy bursting your bubble, Eren Idril.
I suggest you take plenty of rest before things get hectic again for you. The daylight battle is going to start soon in three hours."
'This fucking *********. I'm gonna fuck ***** '
Eren heard Layla's voice and he couldn't help cursing back in extreme irritation.
