I have not done Yaanei lowman yet but just as a general, whenever I've done these 3; Kuth is a joke, even with 4x Banneret he was a pushover. Yaanei's never caused us a problem even when he does Bane a few times. But Sippoy has only ever caused a problem, never had one clean run on him.
Main things:
Dark Arrivisme, huge dispel + heavy damage + it seems to power him up and seems to cap his acc, following it Sippoy would maintain 100% acc for a period of 1-2 mins, which when he dispels my fan dance, wasn't nice.
Malign Invocation: See Screenshots at end, that was under 25%.
His fast cast is far stronger than Kuth's, notably single targets are near instant.
Noting I tank on DNC/NIN, was using RR/VV/Apoc.
Anyone else notice Sippoy can be a bit bitchy? Or do I just have bad luck in dealing with him D:
Malign fun under 25%, wasn't really feeding any TP.
Won in the end though, Apoc atma ftw D: