The Void Knights
The Void Knights are an order of human knights devoted to RuneScape's God of Balance, Guthix. Their task is to maintain "balance" in the world of Gielinor. The monsters known as Pests are a threat to this balance. The Void Knights strive to prevent Pest monsters from entering Gielinor via interdimensional portals, killing any that appear. You can gain experience and rewards by helping the Void Knights in their quests.
Pests and Pest Control
You first encounter Pest monsters in the "Pest Control" game, a combat-based cooperative activity for pay-to-play members only. It takes place on Pest Control Island, which has four interdimensional portals that spawn monsters. You and a group of other players must cooperate to fight the monsters and protect a Void Knight. Playing this game at least once is a requirement for "The Quiet Before the Swarm." It doesn't matter if you win as long as you have played.
Requirements and Recommendations
As well as having played "Pest Control," you must complete the "Imp Catcher" and "Wanted!" quests and have a minimum of 42 Strength and 35 Attack to undertake "The Quiet Before the Swarm." It's recommended that you possess an Explorer's Ring 3; this will let you teleport to the cabbage patch in the quest's starting location of Falador, as well as offering runecrafting benefits. Also recommended: Falador teleport runes or a tablet.
Getting the Quest
Journey to the city of Falador in the Kingdom of Asgarnia. Go to the park in the north of the city. Look for Sir Tiffy Cashien, a white-bearded character sitting on a bench in the park. Talk to Sir Tiffy to trigger the quest. He'll tell you that a Pest has escaped from the Void Knights Outpost; he wants you to speak to the inhabitants of the outpost to find out how this occurred.