I thought it would be a good idea to move any discussion of how to integrate beskar into the current rules in to one place.
So in canon beskar is a metal which is highly resistant to damage, even from energy weapons. We know that it is very rare, only occurring naturally on Mandalore, and between its rarity and desirability because of its physical properties it is very valuable. There is no indication that beskar is any more dense than, say, durasteel, but nothing says it isn’t, so adjustment of encumbrance is a possibility to try to maintain game balance if needed.
My proposal is fairly simple in principle, but the details may need tweaked.
I would suggest that any suit of armor or melee weapon (at GM’s discretion) found in the books could also be forged out of beskar. If an item is forged from pure beskar, it should have the cortosis quality without using a hard point.
Weapons with the Cortosis quality are immune to the Sunder quality. Armor with the Cortosis quality makes the wearer’s soak immune to the Pierce and Breach qualities.
In addition (and this is where the potential tweaking comes in) its price should be increased by ten(?) times, it should be Restricted and of Rarity 10. I don’t think there is a need to increase Encumbrance, but maybe others would disagree.
For Armor, maybe 1 additional Soak? I don’t think any Defense increase makes any sense.
Worked Example:
Let’s say somebody has armor equivalent to the Nightstalker Infiltration Armor, but made of beskar.
It’s stats would change as follows;
Defense - stays at 0
Soak - increases by 1 to 3
Price - increases by ten times to 48,000 and remains Restricted
Encum - stays at 2
HP - stays at 1
Rarity - increases from 9 to 10
It would also retain its special qualities (Add an automatic success to Stealth checks. Add an automatic disadvantage to social skill checks.) and add the Cortosis quality.
Narratively I would imagine light armor like this to use a combination of beskar weave and plates to achieve this effect.
You could even use beskar weave in banal apparel if that’s your kind of thing;
Defense - stays at 0
Soak - increases by 1 to 1
Price - increases by ten times to 250 and becomes Restricted
Encum - stays at 0
HP - stays at 0
Rarity - increases from 0 to 10
Adds Cortosis quality.
Thoughts? Am I missing anything?
Edit to add:
I thought I should also do a worked example with the Mandalorian Armor provided by FFG. My assumption here is that this describes a beskar-free or -lite version of a heavy suit of Mandalorian armor, so finding a pure-beskar suit upgrades it the same as any other type of armor.
Defense - stays at 1
Soak - increases by 1 to 3
Price - increases by ten times to 60,000 and remains Restricted
Encum - stays at 6
HP - stays at 5
Rarity - increases from 8 to 10
Adds Cortosis quality.