function(event, _, subevent, _, _, sourceName, _, _, destGUID, destName, _, _, spellId, spellName)    
    -- Store Target GUID of empowered rends
    if (subevent == "SPELL_AURA_APPLIED" or subevent == "SPELL_AURA_REFRESH") and spellName == aura_env.rend and sourceName == UnitName("player") then
        local targetGuid = UnitGUID("target")
        local rendGlyphId = 58385 -- spell-id goes here
        local hasRendGlyph = false
        local NUM_GLYPH_SLOTS = GetNumGlyphSockets();
        for i=1, NUM_GLYPH_SLOTS do
            if (string.find(select(3, GetGlyphSocketInfo(i)),rendGlyphId)) then
                hasRendGlyph = true
                break
            end
        end
        
        
        if hasRendGlyph then
            rendTime = 21
            --print("glyph there")
        else
            rendTime = 15
            --print("glyph not there")
        end
        local maxHP = UnitHealthMax("target")
        local curHP = UnitHealth("target")
        local perHP = curHP * 100 / maxHP
        if perHP > 75 then --rend does more when applied to >75% health target
            --check if target is already recorded, if it is clear it
            if aura_env.empoweredRendTarget[destGUID] then
                aura_env.empoweredRendTarget[destGUID] = nil
                empoweredRendTimer:Cancel()
                --print("replacing" .. destGUID)
            end
            aura_env.empoweredRendTarget[destGUID] = true
            --print(destGUID)
            empoweredRendTimer = C_Timer.NewTimer(rendTime,function() 
                    --print("cleaning up" .. destGUID)
                    aura_env.empoweredRendTarget[destGUID] = nil end,1)
        else
            --print(destGUID)
            if aura_env.empoweredRendTarget[destGUID] then
                aura_env.empoweredRendTarget[destGUID] = nil
                empoweredRendTimer:Cancel()
                --print("replacing" .. destGUID)
            end
        end
    end
end