Freya and her companions reached the Temple of Mythal and caught up to Corypheus. They saw him die, but he was not dead. Apparently he can jump into anything that's tainted after "dying". They fled inside the temple and pondered about the wonders of it and what it is Corypheus seeks, the so-called Well of Sorrows.
Freya did a ritual that granted them access further inside the temple. Having the choice between following Calpernia and her men or to do more of the rituals in order to gain some head-start, Freya chose the rituals. After finishing these, they entered another part of the temple, only to be surrounded by elven archers.
Their leader, an elf called Abalas showed up, and Freya declared the people they were chasing were the enemy. Abelas believed her and after allying with him, he provided a guide to lead them through the temple. Abelas wanted to destroy the well before anyone could despoil it. Unfortunately Morrigan had plans of her own in seeking the Well of Sorrows for herself, while Abelas chased after her.
Freya and her companions eventually reached their destination, where they met Calpernia again. Freya told her about Corpyheus's plan to bind her and let Calpernia go when she saw reason.
Abelas and Morrigan reached the well at the same time, and Morrigan kept on insisting to use the well to fight Corypheus. Freya tried to stop her out of respect of the old elfs' sacred well, they had chased away Corypheus's minions after all. But Morrigan did have a point stating it will never be safe with Corypheus still out there, and eventually Abelas granted the well's power.
Freya and Morrigan talked about who should use the well. Freya was reluctant to, too many unknowns, and after hearing her companions' opinions on whether she should use the well or not she was certain. Cole had said something about voices whispering in her head. No way she wanted that... She let Morrigan drink.
After returning to Skyhold, Morrigan explained that the key to defeating Corypheus is to kill his dragon first. Nothing easier than that, right?
Freya caught up with her companions and made the best of her time while she still could.
BEWARE! Naked Inquisitor ahead (a bit NSFW
)