Pseudocode for the core combat system.

if( attackhook )
  call hook
  if hook returned 1, exit
endif

if( weapon is projectile )
  try to comsume projectile
  if none, exit
exit

repsys effects

if( weapon is projected )
  play sound and animations
else
  play attack anim
endif

if( combat advancement hook exists )
  call it
else
  THE CORE DOESN'T ADVANCE ANY SKILLS
endif

hit_chance = (weapon_attribute + 50.0) / (2.0 * opponent_weapon_attribute + 50.0)

if( random_float(1.0) < hitchance )
  play hit sounds and anims
  damage weapon (1 in 100 chance to lose 1 hp)

  damage = random_weapon_die_damage
  damage_multiplier = tactics + 50
  damage_multiplier += strength * 0.2
  damage_multiplier *= 0.01
  damage *= damage_multiplier

  if( opponent has shield )
    call parry advancement hook

    parry_chance = opponent_parry_skill / 200.0
    if( random_float(1.0) < parry_chance )
      display parry success
      damage -= opponent_shield_ar
    endif
  endif

  if( weapon has no hit script )
    choose armor piece hit based on zone coverage percentage
    blocked = armor piece ar + character ar_mod
    absorbed = blocked / 2
    blocked -= absorbed
    absorbed += random_int(blocked+1)
    damage -= absorbed
    if( damage >= 2.0 )
       damage *= 0.5
    endif
    1 in 100 chance for armor piece to lose 1 hp
    play hit animation
    applydamage(damage)
  else
    choose armor piece hit based on zone coverage percentage
    calc base & raw damage (exactly like above if no hit script)
    run hit script
    (Core doesn't damage armor if hitscript, do it in the script)
  endif
else
  play weapon miss sound

endif