Report to Nymn at Everlook in Winterspring.
I have heard tales of Umbranse, though I have not ever met him in person. Rumor has it that he's been collecting magical artifacts, though for what purpose, I couldn't say.
Best pass this information on to a trusted ally. Nymn, the high elf, can be found within Everlook, the large goblin town to the northeast. Tell him all that we learned today.