Thorn

Asmoroch Steel Morning Star +1 1d10 B (Necrotic Damage)

A black scorched-like metal which is cold to touch.

Used to craft necrotic damage dealing weapons, such as the sword of life stealing.

Sprout:

In harmony with the forces of nature, you command growth and decay.

Once a day as a standard action, you can point to a single area with this weapon to cause 1 of 3 effects to take effect within a 20 foot range.

1. Vines grow from the ground at point you can see and grip at any creatures within a 15 feet cube. Creatures within the area must make a DC 11+Proficiency Bonus Dexterity Saving Throw or be restrained. Creatures can attempt another Dexterity Saving Throw at the end of their turns. This effect requires the ground to be dirt or a layer of stone no thicker than 5 feet.
2. Thorns launch out from the ground and attack all creatures within a 15 foot cube, forcing them to make a Dexterity Saving Throw with a DC of 12+ Proficiency Bonus or they take 2d4+1 piercing damage. On a successful save they take half damage. This effect requires the ground to be dirt or a layer of stone no thicker than 5 feet.
3. You target a plant no larger than a 5 feet diameter and 20 feet in height to wilt and become brittle for 1 hour or until ended as another bonus action. While wilted, creatures who move onto the plant or are already on it must succeed on a Dexterity Saving Throw with a DC equal to their weight/5 or collapse the plant and fall prone. If the plant is less than 5 feet diameter and 5 feet tall then a creature already on the plant or first moving onto the plant will automatically crumble. If the plant is not destroyed during the wilt effect, it returns to its former state with no ill effects. This effect does not work on sentient plants.