Here are the statistics for the NPC Giant Spider from Warhammer Quest for iOS.

Statistics for Giant Spiders
Wounds 2
Movement 6
Weapons Skill 1
Ballistic Skill 1
Strength 1
Toughness 2
Melee Attacks 1
Ranged Attacks 1

Giant Spiders have the ability to web your warrior. The web will last for one turn during which the warrior will not be able to attack or use anything from its inventory.

Giant Spiders are particularly weak, but because of the web ability, should be disposed of as quickly as possible by spells (Shadow Bolt or Cinder Bolt), ranged or melee combat.