You can obtain one of the following items. Duration will random 1-30 Day:

Zombie Slayer Halloween2021 / APC9 Halloween2021 / Cheytac M200 Halloween2021

AUG A3 Witch / Kriss S.V Witch / Tactilite T2 Witch / Grim Peaper Tarantula / Grim Peaper KeenEyes

Witch Grenade / Halloween Syringe