The last battle with 'you know who' was comically the hardest battle (Ironic as it's one of the easiest generally). It was annoyingly the only mission I had to attempt more than once.
Build I used mostly...
There were lot's of changes here and there depending on what was going on. I even used 5 attack spirits at a few points (Dissonance as well as Anguish). Energy wasn't a problem with Signet of Spirits. I really did want my cap sig back when I capped this. Who'd have thought ^_^...
Communing 11 (+1+3)
Channeling 11 (+1)
Restoration 8 (+1)
-Pain
-BloodSong
-ShadowSong
-Dissonance/Anguish/Disenchantment/Shelter
-Warmonger's Weapon/Wailing Weapon/Painful Bond/Gaze of Fury/Spirit Boon Strike
-Signet of Spirit's [E]
-Mend Body & Soul
-Flesh/Naomei/Sunspear Res Sig
Highlights...
The Drought:
Dropping it criminally quick. Putting Warmonger's Weapon on a Flurry using warrior and the some of the team actually 'dancing' towards the end of the fight. Even though the Drought still had around 50% hp ^_^.
The Desolation:
Getting Revenge on Vahlen the Silent and his annoyingly strong group for destroying me countless times when I used my Dervish on the first play through. Have that you dead person you!
Madness:
For Decimating Shiro in around 2-3 minutes. With no Spoil Victor, no SS, no Empathy, no Insidious Parasite...
In fact I dropped him before the Lich. Quite possibly erroneous but I was curious to see if it was doable (his wand is indeed terrible). He just couldn't handle the combined might of 4 Long-range gun emplacements. While hexed with Painful bond. He barely hit anyone either. Being able to remove conditions (blind) is kinda' pointless if it gets applied every 2 seconds. When Impossible Odds came along Wailing Weapon on a Flurry using warrior kept him perpetually interrupted, even though he was blind anyways (Aegis also helped a bit guess :P ). I can now see why Anet thought it necessary to give it a 25 second recharge. Still too long though! (starts writing a ritualist buff list...)
The End mission:
After triumphantly owning the infernal bodyguard, how annoying it was to face the deranged deity himself and actually lose _-_.
We tried to camp by him and just drop sprits like mad. With only one Warder the knocks where starting to piss me off.
Next time round, we removed some annoying members who thought aggro-ing before the spirits were down was good strategy and we got another warder (Zhed is cool!). My fellow Ritualist friend took Weapon of Remedy for condition removal and damage, plus healing spells (no heal spirits though, the tight...), we dropped him soon enough as well. The battle was really tough surprisingly. Though the morale boost's recharging my Spirits and Signet of Spirits was very helpful .By this time I had dedicated healing so I dropped restoration completely and went for a Communing/Channeling/Spawning set-up. Signet of Spirits was returning 19 energy per cast (plus I had one of those +20 energy forgotten staves from the first run through).
All in all, it was a fun experiment. It worked gloriously for the most part. I despaired a bit at the end for spoiling a perfect run, but Shiro more than made up for it

So there. A happy ritualist story at a time when "OMG ritualist suck" seems to be fashionable. Plus the air was getting distinctly foul in here. Pvp aside, I like my rit...