The Scream Fortress Gargoyle in your inventory will summon the dark spirit of Merasmus from the maps we didn't release this year. Merasmus will answer his cell (if he has enough bars) and assign you an eldritch Merasmission in one of TF’s past Halloween modes! SPOOKY! Fulfilling Merasmissions and reaping souls for his gargoyle will earn you items from past Halloweens and a chance at the new Creepy Crawly Case! Assuming your gargoyle does his job properly. And keep an eye out for spawning Gargoyles while playing—if you find them in time, you can earn extra souls towards your Merasmission total!

Your Scream Fortress Gargoyle keeps track of your progress on active Merasmissions, levels up as you complete them, and shows off your level to other players on the scoreboard. But most people got gold last year anyway, didn't they?