Harmonised mithril rock

A Harmonised mithril rock is a special rock that can appear in the Trahaearn sector's mining area while the voice of Seren is active for the clan. The rocks will last until they collapse, 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.