From the RuneScape Wiki, the wiki for all things RuneScape
The Body talisman
is an item
used in the runecrafting
skill. It allows players to enter the body altar
and create body runes
from rune essence
or pure essence
At the body altar, a body talisman can be combined with a tiara to make a body tiara for 37.5 experience in runecrafting by using the tiara on the altar. This will make the talisman disappear, but the body tiara also grants access to the body altar when worn. Both the tiara and the talisman allow players to use the Runecrafting skill.
Body talismans can be obtained as drops from Guards, Wizards, Hill Giants, and Dark Wizards. The fastest way to get the talisman as a drop is by killing a Guard. The drop rate from Guards is apporimately 1 in 21 or 1/21 drop chance (4.5%)
As of 25 February 2009, as stated in the patch notes, the image for the Law talisman and the Body talisman has been improved to emphasise their differences.
Combining the Body-talisman
The location of the Body altar, North West of the Barbarian village