Originally Posted by
PraisetheSun
Heartseeker seems to calculate the damage based solely on the primary target's distance from Marak, which means the targets don't take additional damage from packing close to place the Heartseekers as far out of the way as possible.
Likewise, simply pre-shielding and dispelling Convulsive Shadows before it ticks will ensure that you never get any pools of crap, and Blade Dash and Blood Ritual will both prefer an eligible target with their respective debuffs over any other, which means that so long as you force the first Blade Dash etc on the right person, the rest of the raid can do more or less whatever the fuck they want. Additionally, every single player-targeted mechanic bar (I think) Heartseeker can be Spectral Guise'd, Feign Death'd, etc.