<p>Yes, <p>No, ealier mission has to be done, it was confirmed by Cipsoft <a rel="nofollow" href="https://www.tibia.com/forum/?action=thread&threadid=4949323">here</a></p><blockquote><ul type="square" style="background-color:#d4c0a1; color:#5a2800; font-family:Verdana,Arial,"Times New Roman",sans-serif; font-size:13.3333px; font-style:normal; list-style-type:square"><li>The style="list-style-type:square"><li>The following quests of the Grimvale questline must be completed to be able to start the new quest: “The Curse Of The Full Moon”, “The Curse Spreads” and “An Ancient Feud”.</li></ul></blockquote><p>So it means you won't be able to start new missions without done earlier missions.</p><p>Additional information <a rel="nofollow" href="https://www.tibia.com/forum/?action=thread&postid=39393626#post39393626">confirmed</a> by Cipsoft that <strong>Feroxa</strong> doesn't need to be killed to access Oskayaat</p>