A weapon crafted by the Eladrin of the Winter Court and embued with Sylvan magic, this javelin covered in thorny vines was designed to keep enemies at a distance. 

When you attack with this magical weapon, regardless if you hit of miss, the javelin breaks, releasing magical spores that quickly spawn thorny vines on the ground on a 10-foot radius, centered on the javelin. The area remains for 1 minute, is difficult terrain and creatures moving through this area take 3d4 piercing damage for each 5 feet of movement they extend. Also, each creature in the area must succeed on a DC 12 Strength saving throw or be restrained. On its turn, a restrained creature can use its action to make a DC 12 Strength (Athletics) to be released from the vines, ending the condition on a success.

Proficiency with a Javelin allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Damage: Piercing, Restrained, Damage, Combat, Thrown, Slow