"
Good girl," the elf woman cooed as Cora consented to the spell. Her pale hand passed over the rough skin of the half-orc's forehead as she spoke the command, "
Upon Garduk's defeat, you will return this sword to the Druidic Council."
Any delusion Cora may have harbored about tricking the druid dissipated; the mere thought of it made her queasy.
Cora:
"Finish the washing up, if you're so eager to get on with things."
"
Let us not waste time cleaning up after these brutes," Quenya said. Revulsion overtook her face as she realized it was the party that had consumed the giants' goat, but she said nothing further about it.
"
Come," she ordered the party and her companions alike. "
Opening the portal will be easier in the next room. Kinak has done some of the work for us already." Without waiting for a response, she led the way through the as-yet-unopened door at the north end of the room.
It was plain to see this had been Kinak's layer. A copper plate connected to a conduit had enabled him to use his lightning attack against the party while they fought in the forge. An obsidian mirror on the opposite wall had enabled him to observe his enslaved giants at work, though the mirror now seemed to show the dwarves of Gruundelheim readying their defenses. The room was without a ceiling, topped instead by a broad sort of chimney that traveled up many hundreds of feet before opening onto a dark sky.
Cora could feel the lingering energy of the god's magic in the room. In this, at least, Quenya was right: opening a portal would not be difficult.
Cora, you are under the effect of a geas spell; disobeying Quenya's command will result in significant, ongoing psychic damage. The wording of the command may be a little vague, so its triggering will depend on Cora's intent. In other words, she will not take damage if, after defeating Garduk, she pauses to drink some water before surrendering the sword. However, she actively avoids or deliberately delays surrendering it, that will trigger the damage.
Also, Cora can feel that the Starbound Blade has been slightly changed by her patron's touch. Bonding with it no longer has the effect of nullifying her half-orc racial traits, so you can once again use Relentless Endurance and Savage Attacks even while bonded to the sword.
Whenever you're ready, opening a portal will require a DC 5 Religion check from Cora, and Quenya will help so she can roll with advantage. The usual, permanent loss of 1d6 HP will apply.