Actually, i have spun the idea as well, and it would be an actual mechanic required. Thralls after capture should not be kept in chests. There should be these rooms we keep them in, which would make the large hoarding of thralls start costing building space.
Once a fighter is placed, it si out and can’t be returned, but imagine having to store crafters in these over night when not in uses, and any unused fighters. Cold be high HP to make it expensive to get into, since you can see what is in there.
to keep from spammers using them as walls, the HP is based by the level of thralls and how many are in there, empty cells are very low, but lets say you can keep 10 in there, so 10 named should be vault HP…150,000.
Starting value 10,000 HP when empty
LEVEL PER HP ADDED MAXIMUM IF FULL OF THAT LEVEL
Level 1 = 2,000 30,000
Level 2 = 4,000 50,000
Level 3 = 9,000 100,000
Named = 16,000 170,000