Astea Frostweb

Astea Frostweb is a Dungeoneering Boss, infamous for her use of summoning and ice barrage.

Attacks
She uses protection prayers which switch every 30 seconds or so, however she will protect herself if she is taking heavy damage from a certain style of combat. Secondly, she summons Ice Spiders (Their level vary to yours) for two per person, meaning she can have up to 8 out at once. These should not be fought, unless waiting for her to switch prayer. Finally, she uses a Ice Barrage and Ice-like Entangle spell. Protect from Magic should be used if you think she is about to use one. Because of being constantly held still, she should be fought with range or mage, however melee works well if you can stay close to her, or trap her.

Using Protect from Magic will result in her summoning more spiders to the player protecting against her spells.

Trivia

 * Her surname is a reference to the fact she summons ice spiders
 * In the journal she leaves behind she talks about finding out something horrible about someone named Bill, and she and Lexicus will have to "kill Bill", hinting at the Kill-bill movies.