Sarachnis, the mother of the temple spiders, is a mid-level boss found in the Forthos Dungeon, in a former burial tomb south of the Spider Den. She can be killed as part of a spider Slayer task.
Sraracha is a pet dropped by Sarachnis at a 1/3000 drop rate, and is a much smaller version of the boss.
Players can right click Metamorphosis to change its form, providing they have used an orange or blue egg sac to unlock its other coloured forms.
To see example setups click here.