The Lumbridge Swamp Caves are a member-only, dangerous cave system located beneath the Lumbridge Swamp. It is home to a variety of slayer monsters and is also known as the "slayer cave", although there are also some friendly faces within.
Players can net fish for frog spawn in these caves. This requires level 33 Fishing. Players may also fish for slimy eels and cave eels. Players will need 28 Fishing to catch slimy eels and 38 to catch cave eels.
The main entrance to the caves is south of Lumbridge, between the water altar and the mining site. This is the most commonly used entrance. You will need a rope and light source to enter. The minimap highlights the location of this entrance with an icon: . A spiny helmet/slayer helmet/full slayer helmet is very useful when using this entrance, as there is a wall beast in between the entrance and the rest of the caves.
The basement of Lumbridge Castle houses another entrance to the caves, though players must have started The Lost Tribe quest to use this route. First break through the loose wall in the south-east corner of the cellar, then go south and mine through the wall there. Players need not wear a spiny helmet if they simply wish to visit the Tears of GuthixDistraction and Diversion, as there are no wall beasts on the path there. You may want to be a level of at least 97 (beast levels are up to 119 so you may want to bring food).
Swamp gas
Some areas of the cave contains swamp gas, which is highly flammable. In the instance that the player is in an area with swamp gas with an open light source, a message will appear in the text box, telling players that their light source flares brightly. It then ignites the gas and causes and explosion shortly afterward, extinguishing the light source in the process. This does around 100 to 200 damage to your life points, depending on the player's Constitution level. However, if players are quick enough, an explosion may be avoided by simply leaving the room with the swamp gas.
This only happens when the player has an open light source, like a lit candle. For this reason, it is strongly recommended that players have a Bullseye lantern or a Seers' headband.
Monsters
The following monsters are found in Lumbridge Swamp Caves:
Big Frog - level 24, a smaller and weaker version of a giant frog.
Wall Beast - Level 35 Slayer required, spiny helm needed for protection from attacks (there are holes in the wall where the beasts can attack you).
Insects, attacks if a player does not have a light source, after some seconds. They will reduce lifepoints really fast, 1-10x3 lifepoints in one second.Damage from the insects does very quick damage (about 25-35 a second with 70 Constitution).
If you speak to a cave goblin and you don't have any light source, while you have a cat he will give you a lit torch.
For some reason if you do not have a lantern and the bugs attack you the hitsplats are the same colour as a hitsplat damaging another person (with a normal attack).
Sometimes, a glitch will occur when you climb in on the rope that you will acutally land on some rocks. However, being a glitch, you will take no damage from it.File:P2..png