dice question

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The campain that we are playing is heart of nightfang spire and we ran into 2 six sided bone dice that have 13 on all sides.

Can anyone tell me what they are and what they do? 
Question regarding the 3rd edition adventure Heart of the Nightfang Spire should be directed to the D&D Previous Editions forum.

Yan
Montréal, Canada
@Plaguescarred on twitter