critical.lua

local creature_table = {}
local lvlcrit = 16221 -- storage (the same like givecritical.lua script)
local chance = 10 -- critical chance = 10%

function onStatsChange(cid, attacker, type, combat, value)

  if not isPlayer(attacker) then
    return true
  elseif cid == attacker then
    return true
  end

  if not creature_table[cid] then
    creature_table[cid] = false
  elseif creature_table[cid] == true then
    creature_table[cid] = false
    return true
  end

  if getPlayerStorageValue(attacker, lvlcrit) < 1 then
    return true
  end

  if (math.random(0, 100) <= chance) then
    if type == STATSCHANGE_HEALTHLOSS or type == STATSCHANGE_MANALOSS then
      creature_table[cid] = true
      local multiplier = (getPlayerStorageValue(attacker, lvlcrit) / 100) + 1
      local new_value = math.ceil(value * multiplier)
      doPlayerSendTextMessage(attacker, MESSAGE_STATUS_CONSOLE_ORANGE, "Critical Hit: "..math.floor((new_value/1)))
      doTargetCombatHealth(attacker, cid, combat, -new_value, -new_value, 255)
      doSendAnimatedText(getCreaturePos(attacker), "CRITICAL!", 138)
    return false
    end
  end
  return true
end