Shrouded Greataxe

You have a +1 bonus to attack and damage rolls with this magic weapon.
When holding the shrouded greataxe, you can use an action to slam the hilt into the ground, summoning a cloud of mist in a 30-foot sphere centered on you. The sphere spreads around walls and its area is heavily obscured. An enemy that enters the cloud for the first time on its turn or starts its turn there takes 1d10 acid damage. The mist disappears after 1 minute. The weapon regains the use of this feature at the following dawn.