The Undercity Swordsmen seem to have disproportionally high armour

[empty tinsel]

I'm talking about the ones in the red overcoats with the cruciform swords and the basic Sinecure swordsman moveset.
For some reason, their armour seems to scale more aggressively than that of other Sinecure units, so that when you enter the Undercity with a slightly underleveled weapon, they can end up being the tankiest enemies in the dungeon, tougher even than the heavies, just because you end up dealing like 2 damage with every hit against them.

This is not only odd in terms of balancing, but it feels like it's also strange when it comes to design language, because visually speaking, they actually look less armoured than the regular sinecure in the black coats who are shown to be wearing plate cuirasses (not to mention the much more visually impressive armour on the heavy units).

[narrow fiber]

Some info on the avakot.org wiki (it doesn't have specific armour or damage numbers) does show some variants - the colours of each outfit, and the weapons they use in different zones (these might change with each hotfix and become out of date at unofficial sources).

https://wiki.avakot.org/Soldier

There are a few enemies listed at avakot wiki which are specifically mentioned as wearing red (Assassins) and using short blades or axes, but the different Soldiers are all shown in darker colours with swords and maces.

There is one type of soldier specifically listed as being found only in the Undercity, and another called the 'Elite' soldier whose picture shows them wearing more armour than the others.