Got a weird request here: if there's gonna be giant spiders at any point, could we get ones that move realistically like actual spiders? No slow lumbering around, I mean go all out for the creepiness factor, have them sit motionless and wait most of the time, and react to proximity with short bursts of huge speed, eg: https://www.youtube.com/watch?v=PXbjBcQCFO0
Starts at the 52 mark on that video.
They shouldn't be slow, giant spiders could be stealth predators and the fastest natural enemy in the game, IMO.
Tarantulas move slow and carefully, but they can also really run when they want to.