OK, next approach!
Have you already been to
Grotland, because this is another portal in
New Kordar that will open at a certain point of this quest?
Before the portal to
Riftland is available you should have the following teleporters and portals in
New Kordar:
1. Teleporter to the portal to
Riftland (see your screenshots).
2. Teleporter near that droid (Charlie-4) where you get the quest
The Droid and the Flower. This ports you to a lower stage where you find the dwarf for the quest
Dwarven Love OR
Trapped Demoness (which ever quest giver you meet first).
3. Portal to
Demonis near the trapped demoness after getting the quest
Dwarven Love/Trapped Demoness or defeating the demoness (I can't remember exactly).
4. Portal to
Grotland in the northern area of the map in a dead end tunnel. This portal appears later in the quest, so if you have cleared this part of
New Kordar, you should check again later.
If I remember right, on
Grotland you will be able to carry on with your quest.
In case you have already been to
Grotland, I have no other idea how to proceed.
BR
J.B.