It seems that, while you can Feint the Lightning pulse (at every 10% hp), you cannot pre-Cloak for an immunity. Also Killing Spree is a great tool for getting up on top of the Pillars. Tricks a DPS target on your pillar, cloak, then KsP (with another person on the first interrupt) and you should be up top with zero stacks every time (assuming you've saved Killing Spree for this mechanic). The mobs on the pillars seem to never use melee autoattacks, so threat shouldn't be an issue. I haven't been doing this yet but I think I might just keep Recup up full time to help out during Phase 2. Also unfortunately Lava =/= Water, so R.I.P.
[Glyph of Blurred Speed]. Just like with other Knockdowns (Sartharion), Ony / Nef's tail-whip can be human racial'd to remove the stun debuff allowing for more damage, but you will still be incapable of movement after the dispel.
In short:
-Cannot cloak Electric Discharge
-Killing Spree for getting on top of Pillars quickly and easily
-Chromatic Prototypes have a threat table, but do not autoattack
-Recup. up during Phase 2 is quite helpful
-
[Glyph of Blurred Speed] (reiterating, it's never worked on lava) will not allow you to walk on the lava
-Human Racial for the knockdown tail-whips