While there are no quests required to take on this behemoth mother spider, you will find that a number of quest givers will ask the player to deal with this spider for them. These are quests given by slayer masters and these will grant you added XP bonuses for taking down Sarachnis. Here is a list of the various slayer masters that you can trigger this quest through: - Turael - Spria - Konar quo Maten - Nieve - Duradel