Shinsu Resistance

Shinsoo resistance is an ability which allows one to resist a certain density or visousity of Shinsoo and it exists naturally, without a contract. Because Shinsoo can be many things in the Tower, Shinsoo resistance could even be defined as an ability to withstand a certain amount of anything made up of Shinsoo.

Note: Shinsoo by itself has no common law. It behaves differently on every Floor and each Floor has areas of varying amount of Shinsoo density. In lower concentrations, it's like a gas but in higher concentrations, it's like water.

Introduction
All Tower inhabitants including Shinheuh, humans and other species have varying amounts of Shinsoo resistance but there are also some who have side-effects to high concentrations of Shinsoo. If the density is much higher than one can withstand, it can cause side-effects like great pain, nausea, bleeding or even death.

Based on the amount of Shinsoo resistance one possess, one might survive a certain amount of damage incurred from Shinsoo attacks caused by an ability or an item(like a Wand or a sword) and not suffer fatal injuries. Guardians of course, have close to ultimate amounts of Shinsoo resistance but this doesn't mean they can't be killed and their resistance might even be a cut above an Irregular's.

Depending on one's ability, this means one can even enter and move around in areas or barriers with a certain amount of Shinsoo density or rather, viscosity, without incurring too much or any restriction of movement. One can also try to force themselves through a barrier with a density somewhat higher than their body can withstand but they might suffer some injuries, like bleeding.

Below are part of the rules governing Shinsoo resistance but the full set of rules is currently unknown.

Ways in which Shinsoo resistance exists
These are the ways Shinsoo resistance can be found by default.


 * 1) inborn but only for Tower inhabitants.
 * 2) However, part of is also inherited, meaning it can be passed down through a lineage. For example: Yuri Zahard has unnaturally high Shinsoo resistance and experiences no restriction of body movement even in areas where female Steel Eels live before they give birth(ch 25). And she probably inherited part or all of this resistance from her grandmother Ha Yurin or if not, her parents. And the first 2 points are probably true for all Tower inhabitants as their parents often pass on their abilities to their children.
 * 3) by being "created" or "simulated", seeing as Macseth created beings like his 4 children or Flux who probably have varying amounts of Shinsoo resistance. His 4 children, by the way, are equivalent to S-class Rankers so it's unlikely they have poor Shinsoo resistance.

It's also unknown how those who come from outside the Tower(Irregulars and certain Regulars) "attain" this ability when it's supposed to be inborn. If not, there may be an additional set of Rules governing them. According to "Of the Tower's Weapons", air and not Shinsoo exists in their world. Although there may be a few similarities between air and Shinsoo, the differences mean one can't easily draw a conjecture like "these similarities allow these outsiders to survive in a Shinsoo environment when they enter The Tower".

Increasing Shinsoo resistance
There are also ways Shinsoo resistance can be increased by natural or artificial means.


 * 1) By adjusting to an area of high Shinsoo density like Rak Wraithraiser who likely hunted on Shinheuh in areas of different density. As one climbs up the Tower, one also gradually gets used to Shinsoo of different density or visocity.
 * 2) By getting used to attacks of different Shinsoo intensity, over time, as one climbs the Tower.
 * 3) By obtaining a contract: like Ruler's Contract or Testing Administrator's Contract.
 * 4) Through items like the Mule Glove, which is an Armour Inventory capable of increasing Shinsoo resistance.
 * 5) Through powers bestowed directly and likely, permanently on a person. For example: By being chosen to be a Zahard's Princess which means a female is bestowed with Zahard's powers through a special method, enhancing her abilities.

There may be even more ways of increasing Shinsoo resistance.

It's also unknown if Shinsoo resistance can stop developing naturally.

But if Shinsoo resistance can be increased, then does this mean one's natural Shinsoo resistance can decrease? This too is currently unknown.

Losing Shinsoo resistance
It's also unknown if one can lose Shinsoo resistance completely: Do Regulars chosen from outside the Tower lose this ability when they go back home if they've failed the 2nd floor tests or have given up on climbing the Tower?

As for Headon, it seems he doesn't lose this ability even after teleporting inside and outside the Tower to choose a Regular. Perhaps, this does indicate losing Shinsoo resistance may happen over time.