Harmonised coal rock

A Harmonised coal rock is a special rock that can appear in the Trahaearn Clan district's mining area in Prifddinas while the Voice of Seren is active for the clan. The rocks have an endless supply, but collapse after a fixed amount of time, however more can appear. The mining experience is the same as the regular rocks; however, because they can only appear with the Voice of Seren active, there will always be an experience boost active when they appear.

Trivia

 * If a player has concentrated coal deposit daily challenge, mining a harmonised coal rock will count toward the challenge.