A whirl of bone and gore batters all nearby enemies, dealing (22.6% of Attack power) Shadow damage every 1 sec, and healing you for 3% of your maximum health every time it deals damage (up to 15%). Lasts 1 sec per 10 Runic Power spent. Deals reduced damage beyond 8 targets.
This talent is named after Lord Marrowgar's ability Bone Storm.
When cast, Bonestorm consumes up to 100 Runic Power to determine its duration. Runic Power gained after casting does not increase an already-active Bonestorm's duration.
If the amount of Runic Power consumed isn't a multiple of 10, there will be an "extra" tick at the end that deals less damage, so that no Runic Power is wasted. For example, a Bonestorm that consumes 45 Runic Power will deal normal damage 4 times, then partial damage once.
This talent was mentioned in the April Fools' Day Legion Alpha patch note preview: "Because we're tired of hearing you shout it on voice chat all the time, Bonestorm has been renamed 'Swirly Body Sticks.'"
Patch changes[]
Patch 10.0.0 (2022-10-25): Now a row 10 Blood talent (was a level 50 Blood talent).
Patch 9.1.5 (2021-11-02): No longer maximum target capped; now deals reduced damage beyond 8 targets.
Patch 9.0.1 (2020-10-13): Now available at level 50 (was 100). Now capped at 8 targets.
Patch 8.1.0 (2018-12-11): Now heals you for a maximum of 15% of your health.
Patch 8.0.1 (2018-07-17): Damage reduced. Heal increased to 3% of maximum health (was 2%). Icon changed (was ).
Patch 7.1.5 (2017-01-10): Heal increased to 2% (was 1%).
[BONESTORM], 
[BONESTORM!], and 
[Shattering Bone]
