I try to move the pet that gets hit with radiating heat to the centre so they don't get frozen, but even if they block Meteor, they get one-shot nuked anyway. Is this a bug? If not, how am I supposed to beat these enemies?

EDIT - Nvm, I figured out what I was doing wrong.

How did you manage to bea tthem? I still get nuked by meteor too :I

This fight is extremely complicated with lots of mechanics that require perfect reactions if you don't want to have a very bad day.

First off, the sisters both place stacking DoTs on all of your pets every turn. However, these DoTs cancel each other out, meaning you need to kill both sisters at roughly the same time, or one of the DoTs will end up killing your team.

Secondly, there are mechanics that require swapping which pet is in your number 1 slot (there is no need for taunting as that is not possible here), as the pet in the number 1 slot will be targeted by certain attacks, and it's crucial you have the right pet in at the right time.

Obviously, paying attention to buffs/debuffs is important, but in particular you want to pay attention to when each sister is channeling a powerful spell. The blue one will sometimes do an AoE after channeling which, if it hits a pet, makes every pet immune to a 'debuff' that is essential to survival. This must be blocked at all costs.

The red one will sometimes put a debuff (called Radiating Heat, fortunately I can remember its name) on one of your pets from time-to-time. The instant this debuff is applied, IMMEDIATELY swap that pet into the number 1 slot. You don't have any time to wait when doing this. Shortly afterwards, the blue sister will use a frost spell which freezes the pet in the number 1 slot to the ground... unless they have the Radiating Heat debuff that is. Right after this, the red pet will start channeling a powerful spell (Meteor). The pet in the number 1 slot *MUST* use Quick Attack to dodge this. Failure to do so will result in that pet getting nuked. Blocking will not save the pet from being nuked, but may merely allow the pet to survive with very low health (once). You *have* to dodge.

This cycle basically repeats a lot.

There are other things they start doing once they're low on health. The red one puts up a healing and damage reflection shield (IIRC), meaning you want to ignore her and concentrate on the other sister. The blue one puts up a damage absorption shield and heals while its up. Nuke this down as fast as possible once you see it.

I think that's it. Remember not to bring a harpy sister down to 0%, unless the other one is also close to 0%. You have to kill them at (roughly) the same time.

Ok thanks so much! I will try again now. This was very useful :D Thanks to you I finally beat them! Thanks again :P