Killing cave slime
|Tier 60+ magic weapon and armour|
|Lost Tribe recommended|
2,700 × Swamp tar (477,900)
Cave slime in the Lumbridge Swamp Caves always drop between 1 and 6 swamp tar, which is currently worth 177 coins each. The easiest way to get to the dungeon is by teleporting to Lumbridge, going into the castle basement with a light source, and enter the swamp caves by the entrance next to Mistag. Head south and west, avoiding wall beasts, until you reach an area with three cave slime. Consult Map:Lumbridge Swamp Caves for more details. Be careful of gas in the caves, as if you have an open light source (i.e. torch, oil lamp, etc.) the gas will explode dealing high damage and extinguishing your light source. A bullseye lantern or similar is recommended.
Attack the three cave slimes in the area with Magic or Ranged. At a high enough combat level you can more quickly kill them with melee. They are level 38 and only have 950 life points, so oftentimes a single hit is enough to kill them. When all three are dead, pick up the swamp tar and wait for them to respawn (it takes about ten seconds from the first one being killed). The cave slimes do use poison, but this only hits a maximum of 13 damage at a time and should not be bothered with unless you have low life points. The cave slime drop an average of 3 swamp tar per monster, and you can kill between 600-900 of them per hour at a medium combat level. This means you can collect between 1,800 and 2,700 tar per hour, depending on your combat level. Sell the swamp tar on the Grand Exchange when finished.