This is the very beginning of the Rikantus / Nek Castle storyline which continues all the way through the current expansion in Chains of Eternity where we see two of the Sisters from the Castle in Ethermere. We learn here that Rikantus is a trader of rare trinkets. (Lore)
This content is heroic no matter which way you cut it, however, with mercs and careful body pulls, you can survive it solo, especially with a pet class. Otherwise it's suggested to at least duo the content now. See the Blackburrow Timeline for more information about quests you can do all in one go. Otherwise, feel free to chrono to level 15 or 20 and do the quests in pieces.