He's in Riftlands, and the way to there opens up after you've completed all mainquests for King Korn Digor. They doorway to Riftlands is in the dwarven mines, where the usable ladder is (very near King Korn Digor's castle).

Can u tell me pls what shoul i do next?. I saved Ele Taera, and now i should accompany her to Las Ksarind. Where cand i find this Las Ksarind? I`ve gone to Castle Merlassar, where the king of elves lives, but nothing happend.It`s a bug, or this Las Ksarind lives elsewhere?
I`m stuck !

Arlania, where Iron Richard used to be. The castle by the 'passageway' that no one would let you through before.

I had the same issue once, went in again and saw nothing in the cave. then I reloaded from before entering again, went in again and there it was.

Thx, i found him but i`m stuck again on main quest.I`ll need to make alliances with dwarves,elves and vikings. I can`t find Queen Amelie anywhere , also Southem Vinland for vikings quest. A little help pls!!:-(

Did someone try to say Ele Taera that she is a Elf and she's gona recover herself, and than when you talk to her again she attacks you? What is the story of the main quest than?

I am having the same issue too. I spoke to Ele Taera, and then to the herbalist who asked me to get the spider glands. But when I looked for the spider in the cave and couldnt find it.

Dont waste your time saving Ele Taera. It wont affect your main quest at all and there is no significant reward, I tried it both ways out of curiousity.

If you refuse to save her and let die in the cave, click on her ghost form and be prepared to fight an undead army. The XP and gold is a lot. When you walk back to her father in the Iron Richard castle labelled as Karradun in Arlania map, you will tell him that you found her but she had turned into an undead and thus was forced to kill her. Her father was very sad and does not wish to talk about an alliance and ask you to leave him for a while. However, he will give you a very pathetic sum of gold for your troubles for attempting. Click on the father again, and he will tell you to find Princess Amelie as he cannot make an alliance with you.

If you agree to save her which you will regret WASTING your time, first, you need to travel to Merlassar after promising her at Griffin Underground Cave that you will be back for her. After reaching the Healer at Merlassar elven town, he asks you for the poison of the spider. You travel back to the cave to find the spider. It will be in the ice spider avatar walking around her. She will be up a slope, the spider will be at the bottom of the slope area. After killing the troop, you return back to Merlassar healer. And then, you have to travel back to Griffin underground cave. Only then you return to the Karradun. When you reach her dad, you will say you saved her in time and she will affirm it. Her dad will be happy and give you another pathetic sum of money ( more than if she dies). Her dad will say he doesnt want to talk about the alliance and shoo you away. When u click on him again, it will be the same end result. He will tell you to find Amelie.

Thus, I recommend, not to save Ele Taera, as it really wastes a lot of time (you cannot do a distant travel from Arlania to Merlassar, you have to go back to Greenwort first and vice versa), no significant rewards like runes or items, just small money and does not affect the outcome of the game.

Of course, if you wish to be a good guy, you could save her

You do get a Wanderer scroll if you have already been to Merlassar though, one of the few points in the game where you are guaranteed to get one...