I was thinking of new spell, Fire Rain, a DPS spell, where this spell will cause the sky to rain fire instead of normal watery rain. The Fire Rain spell will cause defense's troops and buildings to receive small damage, like reduction of 5% (or whatever suitable and not too OP even after upgrades) of total HP.
"Weaken your enemies with Fire Rain from heavenly skies! Cast this spell at the enemy village to cause small damage to all buildings and units"
Or if not a DPS spell, we can make it as COC's very first debuff spell, which temporarily weaken's defense firepower
"Weaken your enemies with Fire Rain from heavenly skies! Cast this spell at the enemy village to cause enemies Will Power weakened for <insert time here>"
