Last time this happened to Arthur, he was stuck inside for 7 years. It is a long time for him although he only watched from inside bear's body. It may not be as long as literally living 7 years but it's still a long time, moreover, most of the time it's fighting and the pain is unbearable.

When the darkness disappeared and Arthur was able to open his eyes again, the first thing he saw was an endless sea of clouds. It did take him a couple of seconds to know inside what creature he was stuck currently.

From the two wide wings and long beak, Arthur was sure he was inside an eagle and a big one at that. The process was just like the previous except the lack of battles. The eagle would rarely fight and would only join in to steal a prey or to finish a wounded creature. With its powerful beak and sharp claws, it did quite the damage but the most outstanding thing about it its eyes and speed.

It could see a prey from miles and miles away and with just a few flaps of its wide wings, it would travel that distance in seconds, especially when it's descending, its speed multiplies by four or five times at the very least.

The struggle had just begun as the long life of the eagle was displayed in front of Arthur's eyes. He only wished this process to be shorter than the last one as he really didn't want to spend all the time alone. The more time he passed without Lucy, the lonelier and sadder he became.

To say it was exciting to watch an eagle fly for a whole day would be a big fat lie. The thrill may remain for the first couple of minutes but by the second, third and fourth day, it becomes boring.

And so, the boring life of a big eagle began, Arthur was forced to watch it all until the damnable eagle died because of a poison it received from a mysterious mushroom.

His luck was not so good to be able to finish this process this early, from the body to of an eagle he transferred to a bird's body, this bird was weak and died in just four months, fortunately.

...

It was only 7 years later that Arthur was finally finished. It lasted the same amount of time as the previous one but for Arthur, it felt like 70 years rather than 7 since it was so eventless and boring. At least he gained some perks after he opened his eyes.

Congratulations! You gained a new skill(passive): [Eagle affinity]: When possessing any kind of flying creature, you gain +50% stats and your flying speed increases by 15%.

Congratulations! You gained a new skill(active): [Piercing Eyes]: The user can activate this skill to lock on a target. If the user is chasing that target, his speed is increased by 200%

Cost: 125,000 per second.

Cooldown: none.

'This could be useful..... but the cost....'

It was really a good skill to have but the cost was just so high so he can't permanently have it. His Mana pool is pretty big, enough for him to use this skill for more than an hour but it's not the same thing as having it permanently.

If it was Stamina then it would have been much better, since he has an infinite amount.

With the small body of the rat, Arthur continued dashing between the small holes but this feeling was a bit nostalgic as it had been a long time since he moved on his own. The Sixth Sense was spread and in just a couple of seconds, he was able to locate several strong presences.

The closest one turned out to be a rat king, it had thousands upon thousands of small rats with it being the biggest and highest in Level.

It had the size of a normal lion and it was quite high-leveled, unfortunately, it was instantly killed by Arthur. He didn't even need to kill it, just forcefully possess it and kill it when he was inside of it.

Arthur decided not to move with this large body since it isn't so practical in these narrow sewers. After he gained what little stats the rat king had, he possessed another rat and dashed out of the swarm or rats.

The second strong presence he felt was a carnivorous bug that resembled a cockroach, truly disgusting to the point that Arthur didn't possess it, the stats it will give would be meager so it's no problem if he ignored one.

When he dug deep underground, Arthur finally found what appeared to be a ritual room, similar to the ones he found in the hidden caves but this one was way bigger and creepier.

There were two people standing around the blood circle, one of them was a foreign Race and had an appearance totally different from humans, as for the last one, it was a hooded figure.

Arthur just stood to the side and watched them both, since he was in rat's body and he didn't do anything strange, there is nothing t worry about. What's more is that both of them were at the Spirit Realm so they didn't unlock the Immortal Sense yet.

"Tsk tsk, I've told you to clean up and start the operation, what is taking you so long?"

"I,I'm sorry but the d-demon lord of this world is a bit weird, he uses clever tricks to locate me and one of my subordinates told me that the demon army is invading the underground in two days."

The hideous looking figure appeared annoyed by the complaining of the hooded-figure, he spat on the ground from annoyance and retorted

"*sigh* You can't even take care of such a simple thing? You just need to connect the two worlds! I didn't hire you to mess around and do some experiments, the boss is impatient and it's not you who is going to suffer from his anger!"

Spit came out of the monster's mouth every time it talked. It was over two meters tall and had an ugly face with a pointy nose, a row of strangely curved teeth with two long fangs. Basically, if we add its black skin, this monster's appearance is the nightmare of every little kid.

The monster took out a cylindric object and after injecting some of its blood on it, a light soon covered it and teleported it out of the underground.

What was left was the hooded figure who Arthur guessed must be the black mage. Despite the fact that he could have killed both of them, he stood still and watched from the side. He still wanted to know what's happening in here, moreover, after hearing what was said, he became more curious and confused.

The monster clearly stated 'Two Worlds' and judging by his appearance, it should not be from Astria. Surely, killing the black mage without any answers would bring more troubles, especially if it's not dealt with correctly.

"Fools.... you think I'll help you after I discovered how precious this world is? Hahaha"

The hooded man started laughing hysterically as he waved his staff and surprisingly summoned two skeleton warriors. He looked around for a second to check if the monster is still present or not then he took out a box from his sleeves and looked at it for a couple of seconds while laughing.

Arthur was surprised to see him use Necromancy too, not only can he use death laws, he can also use Necromancy? The two are close and strongly related but Necromancy is not something easy to obtain.

'Perhaps it's similar to Necromancy?'

The skeletons warriors were just like the ones Arthur uses but they were way weaker since the black mage's Intelligence and skill level are probably low.

The black mage handed the brown box to the two skeletons then he ordered them to slowly open it while he backed away and raised his staff in preparation for something.

Arthur was not afraid so he didn't back away and instead, he sneakily approached the two skeletons. In any case, he always had a Dark Barrier around him, it already became a habit.

When the box was finally opened, the box instantly disappeared and what replaced was 6 feet long portal. From the other side of the portal, you could see a starry sky and soon, the unimaginably strong suction force followed.

"What!? Wh-Where is the tunnel?"

Astonished by what he's seeing, the black mage turned and around and prepared to leave the room as the suction force was too strong but what terrified him is not that force but what he saw, it was that starry sky which seemed harmless at first but it's actually a very, very bad sign, however, it's unfortunate for Arthur as he didn't know that and simply stood there, watching what's occurring.

"Haa..... you made things easier for me."

A deep, bone-chilling voice originated from the portal, it was soon followed by a handmade from bones stretching out from the starry sky and holding on the edges of the portal.

Arthur didn't even have the time to curse or react before a long gray scythe was swung at him, cutting the rat body in two halves. His reaction was late but at least he managed to leave the body before he was killed instantly.

Albeit successfully leaving the rat body, Arthur still had a long scar on his abdomen all the way to his neck. It was caused by the gray scythe which was currently held by a tall hooded-skeleton.

Steam came out of its mouth as it looked at Arthur with its two pulsating red eyes, even Arthur felt chills when he looked at the what's in front of him, for the very first time, he felt as if he was at death's door!

Grim Reaper (Lv???) Realm????