You see a frost spider
Notes
They are weaker than Crystal Spiders but they come in masses. When they are killed they will shortly be replaced by another.
Abilities
Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Location
Ice Witch Temple, second floor, in the centre when Zushuka has spawned.
Behaviour
Frost Spiders chase their opponent and try to obstruct them from defeating their master, Zushuka.
Strategy
There is no reason to kill Frost Spiders unless they are blocking your path to the ice pillar or the altar. You must kill Zushuka to stop the Frost Spiders from spawning. You can use Energy Wall Runes to stop the Frost Spiders from blocking you while you destroy the pillars. For more, see the strategy of Zushuka.