I just finished what was possibly the most stressful run of my healing career (note: I am not a raid healer), but also oddly my most satisfying.
I got Sohm Al for my AST's leveling roulette. The MNK never loaded in; in fact, he was caught in limbo so hard even after we successfully vote kicked him - complete with chatlog confirmation! - he managed to stay in the party another 5 minutes while we low manned our way to the first boss, until the server mercifully dropped him. So the run was already not off to a great start.
We got a replacement NIN to go with our BLM. Now, no one aside from my level 57 self was all that well geared, averaging about i115 from the looks of it, which was completely fine considering we had new folks, but progress was a little slow. I tried to DPS where I could but there wasn't a lot of wiggle room for it, especially since the tank kept standing in AoEs (to his credit, he improved after I brought it up).
First boss went deceptively fine.
Second boss, no one attacked the green add. I'd explained the fight beforehand, with a sly suggestion that we could simply LB it, but I suppose people were tunnel visioned. It blew up at the same time a mark soak went out; a hasty Aspected Helios saved 3 of us but the BLM died.
Tioman. I gave explanations and away we went. The poor BLM could not seem to stay out of AoEs for the life of him; I raised him twice before the wings phase. As the phase started, he died again to Heavensfall. I got him back up, tried to heal and Protect the best I could, but unfortunately we took so long breaking the wings the Dark Star killed him yet again. It actually almost killed me too; when I plummeted to a few hundred HP from nearly full, I didn't understand why until I selected the boss and saw 4 stacks of damage up. I didn't even know she soft enraged the longer the wing phase went on until now.
We managed to break her wings. I popped an ether. The NIN ate a pile of Chaos Blast and died. I raised him first, he LB'd as an AoE circle popped under him and died again. As a sometimes DRG, I felt much sympathy for him, but now I had two dead DPS on my hands. Mana was getting pretty low, I stalled until Swiftcast and Luminiferous Aether came back while praying for a Ewer that never materialized. To make matters worse, with less than 4 people up, the comets were now also marking the tank, who never moved from his spot up front (to be fair, he was simply tanking where I'd advised him at the start). Thank the Twelve for Essential Dignity and Lightspeed. The BLM died another two times before Tioman finally went down. I didn't manage to raise him before then, so he lost out on boss kill exp.
tl;dr I healed the last boss of Sohm Al on my AST where I raised DPS 7 times and almost died to a 5400 Dark Star due to wing phase enrage. It was a lesson in not panicking and assessing my options, definitely a valuable experience but I wouldn't want to do it again, haha.