Rasha'nan
Damage Breakdown

A pretty boring fight to heal. Every 45s the boss does Erosive Spray which puts a DoT on the raid and it needs to be healed. There is some random damage on individuals who are affected by the mechanics but nothing else.
Disc Viability
The timers work well for Disc, being able to ramp every 45s with pet and Evang for every other Spray.
The damage windows last a little bit too long for a Disc ramp and Disc won't be able to cover the damage event, but the damage is very slow and not really suited to Disc's burst anyways.
This log shows Disc doing an insane amount of overhealing whereas more passive healers that want a stacked raid have a much better time:

Things to watch for
There's a lot of movement between the different platforms the boss appears at. That's time spent not smiting and may impact pet timings.
Links
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