local combat = Combat()
combat:setParameter(COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)
combat:setParameter(COMBAT_PARAM_EFFECT, CONST_ME_GROUNDSHAKER)
combat:setParameter(COMBAT_PARAM_BLOCKARMOR, 1)
combat:setParameter(COMBAT_PARAM_USECHARGES, 1)
combat:setArea(createCombatArea(AREA_CIRCLE3X3))

function onGetFormulaValues(player, skill, attack, factor)
	local level = player:getLevel()
	local min = (level / 5) + (skill + attack) * 0.5
	local max = (level / 5) + (skill + attack) * 1.1
	return -min * 1.28, -max * 1.28 -- TODO : Use New Real Formula instead of an %
end

combat:setCallback(CALLBACK_PARAM_SKILLVALUE, "onGetFormulaValues")

local spell = Spell("instant")

function spell.onCastSpell(creature, var)
	return combat:execute(creature, var)
end

spell:group("attack")
spell:id(106)
spell:name("Groundshaker")
spell:words("exori mas")
spell:castSound(SOUND_EFFECT_TYPE_SPELL_GROUNDSHAKER)
spell:level(33)
spell:mana(160)
spell:isPremium(true)
spell:needWeapon(true)
spell:cooldown(8 * 1000)
spell:groupCooldown(2 * 1000)

spell:vocation("knight;true", "elite knight;true")
spell:register()
