The Skull Spider is a crawling skull enemy in Castlevania: Order of Ecclesia. It is a monstrous spider with a skull-shaped body and can climb and crawl on any surface it comes across with, either ground, wall or ceiling. Making contact with it will poison the player. Being a skeletal monster, it is susceptible to Strike-type attacks, so equipping a Macir glyph when fighting them would be a good idea.
It drops the Fidelis Araneaglyph, which summons a Skull Spider to aid Shanoa and will also poison any enemies it comes in contact with, unless they are resistant to this status effect.