Eu queria igual a sua spell, só fazer com que seja em target mesmo, a questão dos tiles, eu removi 1 parte do script e ele não faz mais o esquema dos tiles.

posta a sua versão que eu edito pra target

function onCastSpell(cid, var)
local config = {
spins = 1,
delay = 120
}


local k = checkGroundInArray(getPositionsByDirection(cid), grass)
	
		
	for i = 1, #k do
	addEvent(function()
				if isPlayer(cid) then
				local pos = k[i]
						local grama = getThingFromPos(pos)						
						doTransformItem(grama.uid, driedgrass[math.random(1, #driedgrass)])
						a = (i < 9) and doSendMagicEffect(pos, 1) or doSendMagicEffect(pos, 53)
						doSendDistanceShoot(pos, getThingPos(cid), 36)
				end
			end, (config.delay/2) * i)	
	end	
	range = #k > 4 and 7 or 5
	
	addEvent(function()
		if isPlayer(cid) then
			local pos = k[i]
			local lastPos = false
			for i = 1, range do
				local position = getPositionByDirection(getCreaturePosition(cid), getCreatureLookDirection(cid), i)					
				if isWalkable(position, false, true, true) then
					local creature = getTopCreature(position)
					if (creature.uid > 0) then
						doSendDistanceShoot(getCreaturePosition(cid), getCreaturePosition(creature.uid), 36)
						doTargetCombatHealth(cid, creature.uid, COMBAT_PHYSICALDAMAGE, -142 * (#k - 1), -150 * (#k - 1), CONST_ME_NONE)
					break
					end
					lastPos = position
				end
				
				if lastPos then
					doSendDistanceShoot(getCreaturePosition(cid), lastPos, 36)
				end
			end
		end
	end, (config.delay + (4 * config.delay * config.spins)) )		
			
	addEvent(function()
		for j = 1, #k do			
			addEvent(function()
				local pos = k[j]
				local grama = getThingFromPos(pos)	
				if isInArray(driedgrass, grama.itemid) then
					doTransformItem(grama.uid, grass[math.random(1, #grass)])
				end	
			end, (config.delay/2) * j)									
		end
	end, config.delay * 100)			
	spinRotate(cid, config.spins, config.delay)
return true
end

Só coloca needtarget = "1" no xml e troca o script:

function onCastSpell(cid, var)
local config = {
spins = 1,
delay = 120
}


local k = checkGroundInArray(getPositionsByDirection(cid), grass)
	
		
	for i = 1, #k do
	addEvent(function()
				if isPlayer(cid) then
				local pos = k[i]
						local grama = getThingFromPos(pos)						
						doTransformItem(grama.uid, driedgrass[math.random(1, #driedgrass)])
						a = (i < 9) and doSendMagicEffect(pos, 1) or doSendMagicEffect(pos, 53)
						doSendDistanceShoot(pos, getThingPos(cid), 36)
				end
			end, (config.delay/2) * i)	
	end	
	range = #k > 4 and 7 or 5
	
	addEvent(function()
		if isPlayer(cid) then
			local creature = variantToNumber(var)
			if (creature > 0) then
				doSendDistanceShoot(getCreaturePosition(cid), getCreaturePosition(creature), 36)
				doTargetCombatHealth(cid, creature, COMBAT_PHYSICALDAMAGE, -142 * (#k + 1), -150 * (#k + 1), CONST_ME_NONE)
			end
		end
	end, (config.delay + (4 * config.delay * config.spins)) )		
			
	addEvent(function()
		for j = 1, #k do			
			addEvent(function()
				local pos = k[j]
				local grama = getThingFromPos(pos)	
				if isInArray(driedgrass, grama.itemid) then
					doTransformItem(grama.uid, grass[math.random(1, #grass)])
				end	
			end, (config.delay/2) * j)									
		end
	end, config.delay * 100)			
	spinRotate(cid, config.spins, config.delay)
return true
end

Gostei bastante da magia, poderia deixar uma poça de agua em baixo do inimigo.