Prismatic altar
Prismatic altars are large, cracked rocks surrounded by pillars, used for accessing Runecrafting altars. In order to enter a prismatic altar and train runecrafting, players have to either carry a runecrafting talisman or talisman staff, the type of which will dictate which altar the player will get teleported to.
Locations
There are many prismatic altars located around the world, most of which are inconvenient to get to. There are two prismatic altars located around Barbarian village, which are closest to a Bank and therefore most important - one is located to the north-west and another to the south-east of the village.