From all appearances, goblins waylaid Avorthal in Tham Gelair, leaving no trace of him but his satchel.
'The goblins have slain my son, ${PLAYER}, and for that we will sweep them from Ered Luin! No goblin will take as much as three steps into these lands before we are there to greet him with swordblade or arrowhead!
'Go forth and slay goblins wherever you find them and cry aloud the name of Avorthal. I would have the foul creatures know whose doom has come upon them!
'While you were gone, word came to me that Limael's Vineyard has been defiled by goblins led by a vile creature called Pampraush. Seek out Pampraush and his minions and slay them in the name of Avorthal! Limael's Vineyard lies north-west of Celondim.'
Pampraush and his minions are in Limael's Vineyard, north-west of Celondim.
The apparent death of Avorthal has enraged Cardavor against the goblins. He has asked you to seek out a band of goblins led by a creature named Pampraush and slay them all in Avorthal's name.
Cardavor is at Celondim, the harbour south-east of Limael's Vineyard.
You sought out the goblin Pampraush and his minions as Cardavor requested, but learned from Pampraush that Avorthal may still be alive as a prisoner of dwarves. Cardavor should be told at once.