월간 13시대는, 월마다 1권씩 나왔던 13시대의 미니 서플리먼트들이다. 총 20여권이며, 권당 분량은 대략 8~10페이지 정도로 짧다.

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Dragonriding. Copyright 2015, Pelgrane Press Ltd; Authors Rob Heinsoo, ASH Law.
Temples of the Frog Folk. Copyright 2015, Pelgrane Press Ltd; Authors Gareth Ryder-Hanrahan.
Candles, Clay & Dancing Shoes. Copyright 2015, Pelgrane Press Ltd; Authors Rob Heinsoo, ASH LAW.
Children of the Icons. Copyright 2015, Pelgrane Press Ltd; Author Gareth Ryder- Hanrahan.
Eidolons. Copyright 2015, Pelgrane Press Ltd.; Author: ASH LAW.
Summoning Spells. Copyright 2015, Pelgrane Press Ltd.; Author: Rob Heinsoo.
Sharpe Initiatives. Copyright 2015, Pelgrane Press Ltd.; Author: Cal Moore.
The Strangling Sea. Copyright 2015, Pelgrane Press Ltd.; Author: Robin D. Laws.
7 Icon Campaign. Copyright 2015, Pelgrane Press Ltd.; Authors: Jonathan Tweet, Rob Heinsoo.
Kroma Dragonics. Copyright 2015, Pelgrane Press Ltd.; Authors: Cal Moore, Rob Heinsoo.
Echo & Gauntlet. Copyright 2015, Pelgrane Press Ltd.; Authors: Michael E. Shea, Rob Heinsoo.
The Waking Stones. Copyright 2015, Pelgrane Press Ltd.; Authors: Lynne Hardy, Rob Heinsoo.
Home Bases. Copyright 2015, Pelgrane Press Ltd.; Authors: Steven Warzeha, Rob Heinsoo.
Rakshasas & Reavers. Copyright 2016, Pelgrane Press Ltd.; Authors: Rob Heinsoo, Jonathan Tweet.
Phoenix. Copyright 2016, Pelgrane Press Ltd.; Authors: ASH LAW, Rob Heinsoo.
13th Age in Glorantha. Copyright 2016, Moon Design Publications.; Authors: Rob Heinsoo, Jonathan Tweet, Jeff Richard, Cal Moore, ASH LAW.
Sorcerer Summoning. Copyright 2016, Pelgrane Press Ltd.; Author: Rob Heinsoo.
Coin Tricks. Copyright 2016, Pelgrane Press Ltd.; Authors: Rob Heinsoo, Lynne Hardy.
Gladiators. Copyright 2016, Pelgrane Press Ltd.; Author: Rob Heinsoo.
Temple of the Sun Cabal. Copyright 2016, Pelgrane Press Ltd; Author: Wade Rockett.
Shades of Fey. Copyright 2016, Pelgrane Press Ltd.; Authors: Steven Warzeha, Rob Heinsoo.
Alarums & Incursions: Downtime for Six Icons. Copyright 2016, Pelgrane Press Ltd.; Authors: Gareth Ryder-Hanrahan.
Mounted Combat. Copyright 2016, Pelgrane Press Ltd.; Author: Rob Heinsoo.
Nymphs. Copyright 2016, Pelgrane Press Ltd.; Authors: Cal Moore, Rob Heinsoo.
Further Alarums: Downtime for Seven Icons. Copyright 2016, Pelgrane Press Ltd.; Author: Gareth Ryder-Hanrahan.
High Druid’s World. Copyright 2017, Pelgrane Press Ltd.; Author: Rob Heinsoo