Action Waters Elemntals and Fishing Rod.

local config = {
	waterIds = {493, 4608, 4609, 4610, 4611, 4612, 4613, 4614, 4615, 4616, 4617, 4618, 4619, 4620, 4621, 4622, 4623, 4624, 4625},
	rateSkill = getConfigValue("rateSkill"),
	allowFromPz = false,
	useWorms = true
}

--water elementals config
local find_anything = 30 -- chance to find anything.
local difficulty = 40 -- 1-100 range for difficulty. The higher it is, the less likely it is that player will get a good item

local items = {
[10499] = {2238, 2226, 2148, 2376, 2509, 2168, 7588, 7589, 2152, 2146, 2149, 2169, 7632, 7633, 9811, 9808, 8764, 10220}, -- normal water and massive. I noticed that they are the same one.(based on tibiawikia) QuaS
}
function onUse(cid, item, fromPosition, itemEx, toPosition)

    	if items[itemEx.itemid] ~= nil then
	      if math.random(100) <= find_anything then
  			doTransformItem(itemEx.uid, 2016)
			doDecayItem(itemEx.uid)
			doSendMagicEffect(toPosition, 1)
		else
			local geti = items[itemEx.itemid]
			local newId
			for i = 1, #items[itemEx.itemid] do
				local x = math.random(100)
				                	if (x < difficulty) then
                    					newId = geti[i]
                   					break
							elseif (i >= #items[itemEx.itemid]) then 
                    					newId = geti[#items[itemEx.itemid]]
                					end    
          		end

  			doTransformItem(itemEx.uid, 2016)
			doPlayerAddItem(cid, newId, 1)
			doSendMagicEffect(toPosition, 1)

		end
	end

	if(not isInArray(config.waterIds, itemEx.itemid)) then
		return false
	end

	if((config.allowFromPz or not getTileInfo(getCreaturePosition(cid)).protection) and itemEx.itemid ~= 493 and
		math.random(1, (100 + (getPlayerSkill(cid, SKILL_FISHING) / 10))) < getPlayerSkill(cid, SKILL_FISHING) and
		(not config.useWorms or (getPlayerItemCount(cid, ITEM_WORM) > 0 and doPlayerRemoveItem(cid, ITEM_WORM, 1)))) then
		doPlayerAddItem(cid, ITEM_FISH, 1)
		doPlayerAddSkillTry(cid, SKILL_FISHING, config.rateSkill)
	end

	doSendMagicEffect(toPosition, CONST_ME_LOSEENERGY)
	return true
end

<?xml version="1.0" encoding="UTF-8"?>
  <monster name="Water Elemental" nameDescription="a Water Elemental" race="undead" experience="450" species="ice" speed="280" manacost="0">
    <health now="550" max="550"/>
    <look type="286" corpse="10499"/>
    <targetchange interval="20000" chance="15"/>
    <strategy attack="100" defense="0"/>
    <flags>
      <flag summonable="0"/>
      <flag attackable="1"/>
      <flag hostile="1"/>
      <flag illusionable="0"/>
      <flag convinceable="0"/>
      <flag pushable="0"/>
      <flag canpushitems="1"/>
      <flag staticattack="85"/>
      <flag lightlevel="0"/>
      <flag lightcolor="0"/>
      <flag targetdistance="1"/>
      <flag runonhealth="1"/>
    </flags>
    <attacks>
    <attack name="melee" interval="2000" skill="75" attack="65"/>
    <attack name="earth" interval="2000" chance="20" range="7" target="1" min="0" max="-120">
    <attribute key="shootEffect" value="earth"/>
	<attribute key="areaEffect" value="smallplants"/>
    </attack>
    <attack name="physical" interval="1000" chance="10" range="6" target="1" min="0" max="-209">
	<attribute key="shootEffect" value="snowball"/>
	</attack>
    <attack name="ice" interval="2000" chance="18" range="4" target="1" min="0" max="-103">
    <attribute key="shootEffect" value="smallice"/>
    </attack>
    <attack name="physical" interval="1000" chance="9" range="7" radius="2" target="1" min="0" max="-240">
    <attribute key="shootEffect" value="smallice"/>
    <attribute key="areaEffect" value="giantice"/>
    </attack>
</attacks>
    <defenses armor="30" defense="30">
    <defense name="healing" interval="2000" chance="15" min="90" max="150">
      <attribute key="areaEffect" value="blueshimmer"/>
    </defense>
  </defenses>
<elements>
		<element physicalPercent="70"/>
		<element energyPercent="-25"/>
		<element holyPercent="20"/>
		<element deathPercent="30"/>
</elements>
  <immunities>
    <immunity ice="1"/>
    <immunity fire="1"/>
    <immunity poison="1"/>
    <immunity paralyze="1"/>
    <immunity invisible="1"/>
  </immunities>
  </monster>

<?xml version="1.0" encoding="UTF-8"?>
  <monster name="Massive Water Elemental" nameDescription="a Massive Water Elemental" race="undead" experience="1950" species="ice" speed="390" manacost="0">
    <health now="2350" max="2350"/>
    <look type="11" corpse="10499"/>
    <targetchange interval="20000" chance="15"/>
    <strategy attack="100" defense="0"/>
    <flags>
      <flag summonable="0"/>
      <flag attackable="1"/>
      <flag hostile="1"/>
      <flag illusionable="0"/>
      <flag convinceable="0"/>
      <flag pushable="0"/>
      <flag canpushitems="1"/>
      <flag staticattack="85"/>
      <flag lightlevel="0"/>
      <flag lightcolor="0"/>
      <flag targetdistance="1"/>
      <flag runonhealth="1"/>
    </flags>
<attacks>
    <attack name="melee" interval="2000" skill="75" attack="65"/>
<attack name="earth" interval="2000" chance="18" radius="6" target="0" min="-55" max="-320">
	<attribute key="areaEffect" value="poison"/>
    </attack>
<attack name="ice" interval="2000" chance="21" radius="2" target="1" min="-290" max="-420">
    <attribute key="areaEffect" value="bluebubble"/>
	<attribute key="shootEffect" value="snowball"/>
    </attack>
    <attack name="ice" interval="1000" chance="12" range="7" target="1" min="-190" max="-230">
    <attribute key="shootEffect" value="smallice"/>
    <attribute key="areaEffect" value="iceattack"/>
    </attack>
</attacks>
    <defenses armor="30" defense="30">
    <defense name="healing" interval="2000" chance="15" min="90" max="150">
      <attribute key="areaEffect" value="blueshimmer"/>
    </defense>
  </defenses>
<elements>
		<element physicalPercent="50"/>
		<element energyPercent="-15"/>
		<element earthPercent="100"/>
		<element icePercent="100"/>
		<element holyPercent="30"/>
		<element deathPercent="60"/>
</elements>
  <immunities>
    <immunity physical="0"/>
    <immunity energy="0"/>
    <immunity fire="1"/>
    <immunity poison="0"/>
    <immunity lifedrain="1"/>
    <immunity paralyze="1"/>
    <immunity outfit="1"/>
    <immunity drunk="1"/>
    <immunity invisible="1"/>
  </immunities>
  </monster>

	<item id="10499" article="a" name="any name">
		<attribute key="decayTo" value="2016"/>
		<attribute key="duration" value="120"/>
	</item>