13 Month Series

13 Month Series are the sentient weapons made by a craftsmaster, Ashul Edwaru and are symbolic weapons. The only exception is the Rainbow Undecimber which is an Arms Inventory. When weapons of the 13 Month Series meet, they will resonate(Ch 19) but it is unclear if the same condition applies to the Rainbow Undecimber.

13 Month Series are like half beings, they have human forms sealed within the weapons, that come out and unleash the extreme powers of the weapon when they are Ignited by the user. (Although the weapon may not Ignite for any user, it depends on their personality, For example, the Black March will only activate for "Good Looking" men).

Only a formal Princess can be chosen to receive a 13 Month Series, provided she accepts it(Ch 32). Only a formal Princess can ignite a 13 Month Series, though there're exceptions like Anak Zahard or Baam(Ch 65).

When a formal Princess accepts one of the Series, she automatically takes part in a certain rule.


 * 1) The Princesses appear to be able to kill each other as they wish to obtain the other 13 Month Series as long as the whereabouts of the 13 Month Series in question is still known (shown when Zahard didn't care when Garam killed Uram and seized the Indigo July, but cared once she went missing with it).
 * 2) However, they may not give or even lend a 13 Month Series to another person or they will be executed by the King. This is evident from Chapter 2 where we see the conversation between Evan Edrok and Yuri Zahard about the Black March. And it is likely anyone who was accompanying the Princess would be executed too, for failing to prevent the 13 Month Series from leaving her hands.
 * 3) And it is also unknown what punishment is meted by the King, when they go missing with a 13 Month Series.

The weapons vary in shape and function, for instance, one is a Needle, another a Hook, and the Rainbow Undecimber is actually an Arms Inventory rather than a weapon. The only S-Rank weapon among the 13 Month Series is the Gold November.

The 13 Month Series are however not necessarily the strongest weapons of their type, but they are all seemingly unique compared to other weapons in the tower, being that they are all sentient and only ignitable if the weapon will let you. It doesn't matter how skilled any individual is they cannot force a 13 Month Series to ignite (for example Yuri Zahard being ranked roughly 500th was and so far still is unable to ignite the Black March).

Note: Heice Zahard, upon becoming a Ranker, was presented with a 13 Month Weapon but she turned it down for reasons unknown.

List of weapons & Current owners

 * Silver January -
 * White February -
 * Black March (Needle)- Yuri Zahard > Baam > Anak Zahard > Yuri Zahard
 * Green April (Hook)- Anak Zahard (Original) > Anak Zahard > Yuri Zahard
 * Yellow May - Koon Maschenny Zahard
 * Luminous June - Alphid Zahard (whereabouts unknown)
 * Indigo July - Uram Zahard > Garam Zahard (whereabouts unknown)
 * Blue August -
 * Dark September -
 * Red October - Arie Hagipherione Zahard
 * Gold November - Adori Zahard
 * Colorless December - Eurasia Enne Zahard (sealed)
 * Rainbow Undecimber (Arms Inventory)

Notes and Trivia
The 13 Month Series all have their names engraved on them. The engraving is in Japanese, this is because their creator Ashul Edwaru uses a language based on Japanese. SIU has (in his blog) made it clear that there not is any significance behind this. And that the use of other languages also will occur.