I have developed a relatively complete system for settling combat in roleplaying games.
Base HP: 5
Armor HP values:
0*: +0hp
1*: +1hp
2*: +2hp
3*: +3hp
4*: +4hp
5*: +5hp
Vitasuit/Vitacap/Ancient Plate: +6hp
Shield HP values:
0*: 1hp
1*: 1hp
2*: 2hp
3*: 3hp
4*: 4hp
5*: 5hp
Exceptions:
Stone Tortoise: 8hp
Omega Shell: 10hp
Shields regenerate 1hp per turn when not under attack for two turns. If broken, they do not begin regeneration for 5 turns.