Cost Crashing is a Legends of Idleon summoning upgrade. All Summoning upgrades cost 0.99% less Essence.

Cost Crashing | Idleon Toolbox

All_Summoning_upgrades_cost_}%_less_Essence.

Cost_Crashing

When_spawning_any_unit_during_competition,_+{%_chance_to_also_spawn_an_exact_duplicate,_free_of_charge!

Increases_the_HP_of_all_summoned_units_in_competition_by_a_brand_new_multiplier_of_+{%

Unlocks_the_Cyan_Summoning_Stone,_and_begins_generating_Cyan_Essence._Also,_+{%_Cyan_Essence_per_hour