The context to the below quote is Touka and Seras were facing off against five Black Dragon Knights who ride on Dragons. One of them was the fabled "Strongest of Humanity, " named Civit and Touka used his abilities on them when they turned their back on him to leave after he closed the distance while having a conversation with Civit. So one of the Knights tried to move and killed himself and then:

Suddenly, the body of the bandaged man began emitting an intense light.
Immediate after that...

Bashuuu!

A thick beam of light shot up towards the sky as if it's trying to pierce through the skies.
However, the thick beam of light disappeared in an instant.
Seras looks puzzled as she muttered.

[What in the world... is that just now?]

I spoke out my guess.

[It's probably a signal.]
[S- Signal?]

For example, it may be possibly be a signal that's telling someone about his death.
It may also be a signal that shows the position of the enemy who killed him.
Underneath those bandages...
There may be an automatically-triggered seal that was drawn underneath them?
Just like that time when we found that black egg wrapped in a cloth inside the ruins...
A signal that could indicate the position of the enemy at the time of his death.
Is it originally used so that Civit would come running towards them when they died?

My thoughts: Notice how the explanation of what the light coming out of the Knight might be is repeated three times in the conversation. Two would be okay because Seras questions Touka and he explains. The third time is unnecessary

The context is that Touka is still waiting on Civit to die from poison and is afraid to approach Civit because he is still kneeling and Touka is amazed that it's taking him this long to die and he's able to talk and move around while under paralysis. The light beacon mentioned in the previous example brought about 20 dragon knights to them now and Touka was preparing some skill that utilized his pet slime. The pet slime was preparing the skill after the Five Black Knights mentioned in the previous example turned away from him. So, the skill finally activates:

—Rustle—

[Pii!]

Pigimaru's signal.
I can see that there were multiple "roots" around my eyes.

The true identity of this "root" is that this is a body part of Pigimaru.

Alright...

It's already been connected.

There were two problems regarding this ability.

One of them is that it takes time to get into this state.

The second one is that it's sucking up an absurd amount of my MP while it's activated.

The part where the "root" has encroached over my face would also raise the vigilance of my enemy who had noticed the changes.

Therefore, I couldn't use this during my conversation with Civit.

I could see that my MP is visibly decreasing.

That's why it would be impossible for me to activate it before I had that conversation with him.

Worst of all, it may be possible that my MP would run out during my conversation with Civit and suddenly faint.

In short, it can be said that this "power" that Pigimaru obtained through the Monster Enhancer is something for really short-term battles.

My thoughts: Again, notice how the author repeats himself 2-3 times with the explanation that the skill drains Touka's MP and is a short-term skill as if you couldn't pick up on that the first time it was mentioned. Then it's repeated again in the next chapter just before Touka starts to fight the new Dragon Knights.

Back to the situation with Civit and the Five Dragon Knights. Touka paralyzes them and poisons them, but he also has sleep. He spends a chapter or two worried about approaching Civit because he still feels Civit is dangerous, but he could've put him to sleep and then together with Seras slit their throats and been done with it by the time the calvary of Dragon Knights arrived in response to the light beacon. Instead, he waited on the slime merger skill to activate while he stood at a distance watching Civit die because "a cornered rat might develop some unique skill at the last moment" according to Touka's internal logic. When the calvary arrives Civit is able to tell them not to get too close to Touka and to kill him from a distance. It's apparent at this point that the author just wanted to show off Touka and the slime pet's merger skill.

This becomes unbearable when they arrive at the witch's house and the only thing we get is confirmation the story still isn't going anywhere and a romantic subplot that stands out like sore thumb, and not in the good way. Over the span of 20-ish chapters.

MC has an op skill that forces a status effect on the enemy, eg. Paralyze, poison and sleep. If he hits enemies with his skill, they are a goner.

However he also have a clear weaknesses, his over reliance on his skill, his skill range, the time and action he takes to cast his skill.

this story is not a harem, so far. Only one romantic interest and the rest are just normal interactions with women. This may change but I cannot see that happening anytime soon. Regarding his OP abilities, all I can say is that the restrictions more than compensate for it.

In later chapters he meets up with some of his less terrible classmates, realizes they're basically sheep/Mob-characters that follow anyone with a personality, and decides to not to kill them.

He was abused as a child to an extent that it's almost unbelievable for an first-world nation. If it did happen, and managed to go unnoticed for that long, his parents would be in jail and he would have been on the news. But somehow none of his classmates knew anything. Most children that survived that sort of torture would be mentally and emotionally crippled, but the MC is just heavily scarred.