[Vrul]

local SPELL_ID = 24275  -- Hammer of Wrath
local SPELL_NAME = GetSpellInfo(SPELL_ID)
local UPDATE_INTERVAL = 0.1
 
local frame = CreateFrame("Frame", nil, UIParent)
frame:SetPoint("CENTER", UIParent, "CENTER", 0, 0)
frame:SetSize(64, 64)
frame:Hide()
 
local texture = frame:CreateTexture()
texture:SetAllPoints(frame)
texture:SetTexture(GetSpellTexture(SPELL_ID))
 
frame:SetScript("OnEvent", function(self, event, spellID)
    if event == "SPELL_ACTIVATION_OVERLAY_GLOW_SHOW" then
        if spellID == SPELL_ID then
            frame:Show()
        end
    elseif event == "SPELL_ACTIVATION_OVERLAY_GLOW_HIDE" then
        if spellID == SPELL_ID then
            frame:Hide()
        end
    end
end)
frame:RegisterEvent("SPELL_ACTIVATION_OVERLAY_GLOW_SHOW")
frame:RegisterEvent("SPELL_ACTIVATION_OVERLAY_GLOW_HIDE")
 
local timer = UPDATE_INTERVAL
frame:SetScript("OnUpdate", function(self, elapsed)
    timer = timer + elapsed
    if timer < UPDATE_INTERVAL then return end
    timer = 0
 
    if IsSpellInRange(SPELL_NAME, "target") == 1 then
        frame:SetAlpha(1)
    else
        frame:SetAlpha(0.5)
    end
end)
 
frame:SetScript("OnHide", function(self)
    timer = UPDATE_INTERVAL
end)