Limitless Summoner: Rise of the Soul God - Chapter 125: Out and about

Chen Yan travels between worlds, ending up becoming an honorable prince in a medieval fantasy world. Yet this world was not quite as simple as he thought. Witches with magical powers abound, and fearsome wars between churches and kingdoms rage throughout the land.

Roland, a prince regarded as hopeless by his own father and assigned to the worst fief, spends his time developing a poor and backward town into a strong and modern city, while fighting against his siblings for the throne and absolute control over the kingdom. Join Roland as he befriends and allies with witches and, through fighting and even farming, pushes back invaders coming from the realm of evil.

- Description from Novelupdates

The protagonist travels through Shu Mountain and becomes a demonic dragon guarding the heavenly book in Dinghu Peak.

An ordinary (?) grandfather, Choi Chuntaek. In an effort to protect his granddaughter, he started the virtual reality game 'Arkstar.'

Then... he accidentally obtained a legendary class?

Qin Huai crossed into the mysterious fantasy world where demons were rampant and heroes were rising. He had no background or cultivation qualifications until the day he became a medicine store apprentice and started to cultivate with his fellow apprentices.

He found that the experience orbs actually fell out of his master and brothers.

He learned to grind medicine with his brothers.

“Ding! ‘Medicine Art’ Experience+3!”

His Master and brothers practiced martial arts.

“Ding! You picked up an ‘Essence of Qi Cultivation (White)’, ‘Qi Cultivation’ experience +3!”

He killed the bandits in the mountains and picked up their cultivation.

“Ding! ‘Astringent Breath Technique’ experience +13!”

His master said that the technique was not good at attacking, had a cultivation limit, and could only prolong life.

But when Qin Huai picked up the experience until the Astringent Breath Technique was 50 times stronger, his body took a tremendous change. A gentle push of his hand was like a wave. He could now both attack and defend.

People said that when two kinds of cultivation methods clashed, continuing to cultivate would lead to the death of the cultivator.

However, when Qin Huai picked up experience and directly skipped the cultivation process, he found there were no side effects at all!

When Qin Huai practiced more and more cultivation methods, he suddenly found that those methods interacted with each other in his body and became stronger skills.

…

Qin Huai, who could pick up experience, began to wander among the major powers.

He saw flesh growing from white bones and the dead revived.

He saw demons cooking 10,000 people and exuding extremely evil energy.

He saw the Buddha statue chanting in the temple. Sanskrit sounded like a mantra.

Qin Huai silently picked up experience in order to settle down in the chaotic world.