Garrosh died for thishttps://twitter.com/Wowhead/status/1216803653895540736 …
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He had such a knowledge of war, that he could even control the powers of the Elementals and Old Gods. He became so powerful... the only thing he was afraid of was losing his power, which eventually, of course, he did.
Unfortunately, he had challenged his once mentor-Thrall to a mak'gora and in their battle, Thrall used the elements to strike him down. Ironic. He taught others to use the power of the elements, but not himself.