World of Warcraft 9. 1 unified debris upgrade method;

There are five levels of control debris, except the basic level, and the corresponding ghost embers are needed for an upgrade.

With the upgrade of the grade, the required quantity is different, which is 5/ 15/30/50 respectively.

Story background (Blackstone disaster)

After the invasion of natural disasters, the continent of Azeroth was devastated, and the Fiwood forest became a dead silence. The rotting bodies of the Tirisfa rangers who had already died but stood up again were filled with thick fog all day, and the desert of Cyrus was undercurrent. The kingdom of Lordaeron was destroyed, and Illidan betrayed the night elves and was exiled to Outland.

Former Prince Arthas finally ascended the frozen throne and became Northrend's new Lich King. The war seems to have subsided temporarily, because the fragile agreement reached by the warring tribes and alliances seems to have been gradually forgotten.

In Tal, the arid land of Dulong, the tribe led by Sal camped and expanded the size of the army. They invited the former High Elf Ranger who also hated the Alliance, the current forgotten leader Sylvanas Windrunner and his forgotten people to join the tribes of orcs, tauren and trolls.