There are various properties that effect combat.

skill.combat - combat skill. between 0 and 150 for most mobiles. Used for both sides. There are variants 'skill.unarmed', 'skill.cutting', 'skill.impact', 'skill.stabbing' that are used instead if available. No UI to these though.

fakeskill.combat - used to make a mobile appear much weaker than it actually is in the output of the consider command.

att.str - used for attacking side.

att.dex - used for defenders side.

armour - used for defending side

damage - used for attacking side. comes from the weapon if it exists.

maxload - used for determining encumberance

The regular values are as follows -

	HP	Dex	Str	Skill	Damage
boss	200	40	40	100	40
very hard	200	30	30	80	30
hard	200	20	20	70	30
tough	200	20	20	60	25
medium/navy officer	200	20	20	50	20
easy	200	15	15	25	10
civilian	200	10	10	0	10
child	100	10	10	0	0
animal	50	10	10	0	0
bug	10	10	10	0	0

You can set the Immortal pflag on a mobile to indicate it can never be killed. When in combat, players will curiously make weak hits if they would otherwise kill it.