Red spiders' eggs

Red spiders' eggs are a Herblore ingredient that members can use to make one of three different potions. Those with level 22 Herblore can combine them with a harralander potion(unf) (made by adding clean harralander to a vial of water) to make a stat restore potion and gain 62.5 experience points. Those with level 63 Herblore can combine the eggs with a snapdragon potion(unf) (made by adding clean snapdragon to a vial of water) to make a Super restore potion and gain 142.5 experience. Those with level 73 herblore can combine the eggs with coconut milk and a cactus spine to make extra strong weapon poison and gain 165 experience.

All players (even free players) can give red spiders' eggs along with a limpwurt root and 5 coins to the apothecary in Varrock, and he will give them a 4-dose strength potion in return. This exchange used to be the only way to obtain a potion in the free-to-play version of RuneScape prior to the introduction of the Grand Exchange, and is still the only way to obtain this potion without at least some assistance of a member, even if indirectly via the GE.

The Creature creation activity uses Red spiders' eggs in conjunction with raw sardines to create a monster which, when killed, drops multiple red spiders' eggs.

Obtaining red spiders' eggs
Members with level 10 Summoning can obtain red spiders' eggs from a spirit spider familiar, in conjunction with an egg spawn scroll. This will drop anywhere between 1-4 red spider's eggs and use 6 Special move points.

Red spiders' eggs spawn in a number of places, especially areas where deadly red spiders can be found. Spawn points include:
 * In Varrock Sewers - 2 egg spawns (every 30 seconds)
 * Edgeville Dungeon (Pay-to-play, low level Wilderness) - 6 egg spawns
 * Karamja Volcano - 1 egg spawn
 * Along the path to Tirannwn from the main gate (members only, requires start of the Regicide quest and completion of its prerequisite quests) - 3 egg spawns
 * Red Spider's room in the Chaos Tunnels - 7 egg spawns.

Players may also obtain red spiders' eggs as drops from the following monsters:
 * Cave crawlers
 * Spidines
 * Cockroach drones