In Multiple occasions, I have been raided by rushed people that use 4 level 1 Quake spells, and i end up 2 starred with 2/3 of the available loot gone. If Earthquake spells used on walls Significantly higher level than them, A sort of "rubble" would be created which would slow troops down and have a small chance of damaging them.

It would work like this: A wall 6/7 levels above the level of the earthquake spell would create rubble which would slow all troops that go through it by 20%, have a 5% chance to take 100 Damage or Lose 8% Of remaining health, whichever is greater. A wall of 8/9 levels above the Earthquake spell level would slow troops going through it by 30% and have a 8% chance of taking 120 Damage or losing 10% of remaining Health, whichever is larger. Finally, Walls 10+ Levels higher will slow troops by 38% and have a 10% chance of -15% total hp or -150 HP,whichever has the largest sum. Finally, A 5% chance of -30% permanent movement speed

Thank you for reading, Please reply and constructive criticism is appreciated