When it comes to combat and hunting techniques, the polar spider is exceptionally clever. The spider usually hides in a deep snowbank where it is 75% undetectable due to coloration, stillness, and experience, and rushes at passing prey, surprising on a 1-4 on a d6. This spider's bite is fatally poisonous, and all saves vs. poison are at -2 against it.
Skills: Monstrous spiders have a +4 racial bonus on Hide and Spot checks and a +8 racial bonus on Climb checks. A monstrous spider can always choose to take 10 on Climb checks, even if rushed or threatened. Monstrous spiders use either their Strength or Dexterity modifier for Climb checks, whichever is higher. *Hunting spiders have a +10 racial bonus on Jump checks and a +8 racial bonus on Spot checks.
Snow spider skill bonuses:
Skills: Snow spiders have a +4 racial bonus on Hide checks, a +20 racial bonus on Jump checks, a +8 racial bonus on Spot checks, and a +8 racial bonus on Climb checks. Snow spiders use their Dexterity modifier instead of their Strength modifier for Climb and Jump checks. Snow spiders can always choose to take 10 on Climb checks even if rushed or threatened. *In snowy or icy environments, a snow spider's bonus on Hide checks improves to +8.
I'm thinking we retain the usual +4 Hide, +10 Jump, +8 Spot. We don't currently have a climb speed for them. Shall we give them one?
Shall we stick with the snow spider's +8 Hide improvement in snowy areas, or go even higher since this is even more greatly linked to the polar spider's tactics?
I think a racial bonus on Balance checks might also make sense, to go along with the icegliding/bull rushing. Thoughts?
CR 5 seems reasonable. Its about on par with the phase spider; it has deadlier venom, but lacks the maneuverability and 1 greater HD of the phaser.
Ice Rush (Ex): A polar spider can attempt to knock down any creature that it successfully bull rushes on icy surfaces. The target must succeed on a Balance check (opposed by the polar spider's Strength check made to bull rush) or be knocked prone at the end of the bull rush.