Tank-specific tips for Extreme Primals

[Serneum]

My reply is majorly late, but for those still struggling:

Garuda
To quickly and safely pick up your assigned sister, build up your combo with the first two hits (Fast Blade>Savage Blade or Heavy Swing>Skull Sunder) on Garuda. Then, hit a Rage of Halone or Butcher's Block on your assigned sister as soon as they spawn. Pre-emptively using an offensive cooldown helps with snap aggro too. Provoke is unnecessary here and should not be used in this situation. This is a basic and essential tanking technique and you should probably be already familiar with it.

A simple Shield Lob tends to snag me Suparna relatively easily. Then I Circle of Scorn, Flash, and Spirits Within as well.

During each sisters phase, predict the incoming burst damage (Wicked Wheel/Downburst) and pre-emptively pop a defensive cooldown to mitigate it. If you're tanking Garuda + Suparna, the burst occurs after they teleport and very shortly after Suparna casts Friction. It also helps to apply Rage of Halone / Storm's Path on one or both targets beforehand. If you're tanking Chirada, you'll get a red targeting symbol on your character a couple of seconds before it happens.

First phase, it's always after Friction from Suparna. Suparna/Garuda jump after Chirada takes a certain amount of damage, so the fewer people on Chirada the less likely they are to jump before the Friction and Wicked Wheel. We run a lot of ranged and burst Suparna down first. With one melee on Chirada, Suparna dies before they jump 90% of the time.

Second sisters phase, double Wicked Wheel will always come after Suparna casts her Slipstream.

Some feedback:
(4) Should mention what cooldowns you're using. For PLD, use either Sentinel or both Foresight and Rampart for each double WW (you can't have Sentinel due to CD time) -- go head and use Sentinel for the first. You only have one double WW, so Sentinel alone is enough.

Not entirely true. I can usually have my Sentinel up a few seconds before the next double Wicked Wheel. It's not a guarantee, but it is possible to do, even with really high DPS.