Maybe next halloweens special auction weapon?
Heres an idea i have :0

Scream's knife(Super rare Auction weapon)
Damage:11
Look:Like Scream's knife and blood on the tip
Speed:Slow
Special effect:Cursed(this ability curses the player and deals automatic 2 damage every step they take for 6 seconds)

Start price210k
Amount in game:5

Dont say "oh i can get a bar with that money."
Because understand this is rare and only 5 will be in game