Arachnis is the second major boss in Sonata of Blood. She is half-woman, half-spider.
Arachnis will quickly scurry across the battlefield. She can bite, poisoning the player, pounce, and jump to the ceiling or walls. She can also shoot webs, which slow the player. Later in the battle, she can create a web shield to heal herself. The shield can be destroyed. She has 3000 HP. Her theme is Snake Head Medusa.