The Crest of the Frozen Snow Clan

As part of their graduation ceremony from the shadow school within which the Ninja of Borealis are trained, they receive a marking to identify them as part of the Clan. Unlike other markings given around the world that are in the form of a tattoo, this one is given as a frozen brand upon the skin. The graduate is allowed to choose the location as long as it can be easily hidden and is required to not make a sound while receiving the marking.

The brand also infuses a special kind of secret substance into their skin that reacts under the right conditions. This is done so that if one of their ninjas ever has to prove that they are indeed a part of their organization they can use the marking as evidence.

As one of the potential future heirs of the clan upon her graduation, Lumi was given the Heir's Mark, which has additional snowflakes incorporated into the design and marked her as having higher power than others of the clan.

Lumi's mark is located between her shoulder blades.

For each successful mission, the ninja completes on their own or as the leader additional snowflakes are added to the design. Extra rings are added in the form of small dots for successful assassinations in which they were either sent out alone or delivered the killing blow.

Lumi was diagnosed with the Cold Death about a year after her graduation. At the time, this was the most intricate marking ever earned in the history of their Clan within the first year of being an active Ninja.