Thundering

Thundering is the Dragonflight Season 1 affix for Mythic+. It is applied as a seasonal 4th affix that is added to every Mythic Keystone at level 10 or higher.

Every 60 seconds in combat, all players will receive either Mark of Lightning or Mark of Wind. Both marks will increase damage and healing by 30%, and make you immune to roots and slows, for 15 seconds. If the mark expires while another player has the opposite mark, it will cause an overload. Overloaded players are stunned and take nature damage every second for 5 seconds. Touching a player with the opposite mark will remove both of them without causing an overload.