Exclusively female infernal that can appear as a beautiful woman or gigantic black widow spider

The Arachnea are an exclusively female type of infernal that can appear as either a beautiful, often elegantly-dressed young woman, or a gigantic black widow spider. They are very intelligent, and can cast spells in either form. An arachnea's favorite tactic is to seduce or cast **charm person** on her victim to lure them in for a kiss (if she is in her human form) or to bite them (if she is in her spider form). Arachnea are highly magical in nature and can use the following spell-like abilities at will, in either form: **web**, **charm person**, **teleport**, **hold person**, **darkness 15' radius**, **mind reading**, and **clairaudience** (as the potion), and can only be hit by magical or silvered weapons. It takes one full round for an arachnea to change forms. She also has the ability to summon 1d6 giant spiders of any sort. As with most infernals the arachnea is underneath it all quite cowardly; after losing more than half her hit points, she will try to cast **teleport** on her next round to escape.