Feeling the cease in most of the mana flow that walker had been connected to, he began to sense the changes in the wind. There were many right away. Ventus was the one managing them though.
The wind currents were well established. Making a literla mountain was something that would change that flow of nature again. But the fact that the system generated quests for everyone that was participating, let alone allowed them to gain experience points, proved this was not wrong.
It was not an act that would cause massive damage to the world. This would have been something that would be stopped if it were to create a desert or destroy the land. Walker could sense that within he mana, if not just his gut, all together.
Creation is hard, cheer me up!