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<span class="mu-s">Dexterity (Stealth) Check: Remain Hidden - Disadvantage</span>
Roll 2d20, discard the higher roll, then add Aranuel's Dexterity modifier (+1) to perform a check with Dexterity (Stealth) with Disadvantage.
(Best out of 3.)
The creature has darkvision, hence disadvantage. Regardless, you attacked unseen, and there is room for you to hide from line of sight. If you can take it down without engaging directly, you will take every opportunity to, as fighting it head-to-head may be risky; you simply must roll higher than the creature...