Keepers United
While the Keepers of Olvar were dealing with the aftermath of their battle and the witch's hut, Radagast took off for Dol Guldur. He was able to reach it in time to assist the Keepers of Dinar with destroying the hydraken.
"Lainadan, Sky, and Borjnen... could you go join the Keepers of Olvar? The darkness in the south seems to involve Moridreth, the Dark Witch of Numenor. She is supposed to have been dead and destroyed since the fall of Numenor lo these centuries ago. I do not know what dark magic has summoned her to the here-and-now, but the Keepers of Olvar were lucky to have faired so well against her, though perhaps her power has weakened since Numenor."
"The rest of us shall root out whatever darkness still lingers within these ancient ruins, now that that abomination of a creature has been destroyed."
"I have also heard from the Keepers of Kelvar. They encountered some dark Orogs that had deadly dark weapons and armor. They were mostly able to eliminate them from range, but they send you this warning: avoid the touch of that dark armor and those dark weapons."
"They proceed into the northern woods to find the source of darkness there, though they believe it is the demon-spider Shelob."
However reluctant the three Keepers of Dinar are, they acceed to Radagast's request, and are soon rapidly following one of Radagast's Rhosgobel rabbits to where the Keepers of Olvar are.