Terraria (Wiki): Nettle Burst

The Nettle Burst is a magic weapon that fires snake-like vines that extend up to 24 tiles. The created projectile will travel for approximately 2s until it disappears. During that, enemies without knockback immunity are stun-locked, penetrate DEF by 10 (desktop, mobile, console), and get damaged 9x (total of -250HP).   In combat, like the Vilethorn and Crystal Vile Shard, players may opt to build walls and kill enemies from cover without taking damage through the Nettle Burst’s wall-piercing capabilities. This unique property also makes the magic weapon a good choice for annihilating segmented enemies or bosses.   Nettle Burst is best modified with Mythical for a wide variety of improved stats.