Amulet of the Planes
Taara has worn it since before the party met her. She never spoke about it, and nobody asked.
Session 30
In the Sorceress's den, Taara cast the Transfer spell (The Gift) with Myra's help and moved Ether's Flame out of the caged, helpless Logi and into the Amulet. Then she used it to cross the planes to Ether, taking Myra and Logi with her. The crossing took a few spokes of Logi's cage along, and split Mark, who stood just out of range: his evil side and his evil sword went to an unknown plane.
Session 31
On Ether the flame went out of the Amulet and back into the Burning Tree, and then the Amulet flew home, carrying Taara, Myra and Logi: Ether's Reignition.
Current Status
With Taara, in front of the werewolf den. It no longer holds Ether's Flame.
The crossing in session 30 did not take them to Ether; it brought Ether to the Shadowfell. Taara does not know. Why the Amulet could fly home without the Heart in it is open (session 31, DM notes).