Nah, I was thinking more along the lines of ‘you know they’re out there, you just don’t know where they are’. Plus a tough new form or two of monster can shake up a long-term survivor’s gameplan. A zed mine would be easy to spot irl, so it kinda loses credibility. Also scaryness.
Let’s see-
Some kinda ambusher for buildings- they’re not snow-themed, but they’re fast, hard to spot, show up in groups and I’d suggest giving them a high-probability disarm attack. They shouldn’t aggro until the PC’s taken a couple steps inside the building, (preferably they’d be able to attack from all sides).
Something like a snow-worm; moves quickly under the snow, vicious attack, perhaps a strong poison. Would be nifty if it just barely showed up while it moves under the surface- (white , instead of a white .)
A straight-up Wendigo. Zombie-hulk version of a player who’s coked up on meth, sporting CBMs and decked out in platemail. Bigger, tougher, faster, stronger version of a hulk. Camo until the pc’s somewhat close (8 or so tiles) would also be nice.
The lore for the ambusher would be a late arrival of the portals, for the snow-worm it’d be the graboid’s new offspring, (aren’t they known for mutations in the sequel or something?), Wendigo can be something of a mystery- possibly a mutated hulk, possibly a mythological creature. The resemblance to the latter should cause the confusion.
–Hehe, you could vastly increase the wendigo’s spawn rate during storms. But those would need work anyway, (blizzards and visibility for instance).