I'm just about to try out this encounter and wanted some tips/advice for Assassination uptime and talents for this fight to maximise output throughout.
To start with, is Elusiveness pretty much the talent to go with so you can stay inside the damage buff during sparks longer? How many stacks can you effectively take if so before it mostly becomes too much?
Secondly to further on the sparks phase. Pretty much I've always kept rupture going on Elegon, but is it worth rupturing the sparks, or doing small envenoms just to keep slice rolling when redirect is on cooldown? I mostly find they die at barely 2 or 3 cp's at most.