Give turrets something like Poppy's old passive, or a max limit to the damage they can take at once
Because inhib turrets being deleted by Ziggs' W Cast->Lich Bane+Passive->W Detonate is ridiculous
The limit can be high enough where it wouldn't affect anything other than being 2-shot by Nasus or 1-shot by Ziggs. Something like "Turrets can't take more than 20-25% of max hp per attack".
Example: Ziggs' attack would normally do 1650 damage to the top inhib turret (50% hp). With the limit being set to 25% max in a single attack, his attack would instead only do 825 damage. Any champion that normally hits the turret for less than 825 damage per attack would be unaffected.