Seradi Stormcaller [ Quest 65+ ]  

If you do not have the tarbon series & Cure the Crude and Stop the Spreadng:
You say, 'Hail, Seradi Stormcaller'

Seradi Stormcaller responds in a deep, thumping voice, 'Hello. I'm sorry, but I have no time for casual conversation. If you wish to help us here, then speak to Garvin or perhaps Tabron, they have many urgent tasks to accomplish. May the wind be at your back, traveler.

Seradi Stormcaller looks upon you warmly -- he appears to be quite formidable.


Once you have both:

You say, 'Hail, Seradi Stormcaller'

Seradi Stormcaller says 'Welcome, friend Tanise.' Seradi's voice booms. 'I have heard good things about your willingness to assist the folks of Oceangreen. Even Garvin spoke kindly of you, after his fashion. Tabron has discovered some interesting and disturbing things with your help. We now know that the waters of the lake in the nearby cavern have been heavily tainted. To the best of our understanding, this couldn't happen without some form of, well, [concentration] of the taint.'

Concentration

Seradi Stormcaller says 'The water in the lake hidden in the hills is tainted, but not nearly as much as that of the cave. The water in the town is actually less tainted than the water of the lake in the cave. Even though that lake has a constant influx of fresh water, it never appears to reduce the disease. So I believe that there is some agent of disease in that cave feeding taint into the lake. We have sent a few scouts, but fewer still return. Those that do speak of diseased animals and plants and you yourself saw some diseased treelings. Right now our forces are dedicated to the defense of the village, but I cannot deny my nature. I would ask you to seek and destroy the source of the taint in that cave. Can you [do that] for me?'

Do it

Seradi Stormcaller says 'Ah, great! I do not doubt your ability, but I would not see you harmed. I recommend that you seek others to assist you in this task.'

Kerrin also mentions him identifying the link:

Kerrin the Unkempt says 'Of course this would not be just for Antonius, you would be aiding the creatures of this small glade as well. We seek a cure to the illness that has taken so many fine treants, livebriars and young treelings. We hope that finding such a cure will assist Seradi with a cure for the illness that plagues the creatures of this land as well. Will you help us?'

i keep hearing people say he gives a task "the deathless"
all he says to me is "hello, im sorry. but i have no time for casual conversation. if you wish to help us here, then speak to garvin or perhaps tabron, they have many urgent tasks to accomplish. may the wind be at your back traveler
and hes listed as a quest npc but cant find anything about the quest other then the name