Arcane Pressure

Through countless attempts to create new metamagic you discovered something else. You can increase the firepower of a spell with reduced input by concentrating on slowly increasing its density. You gain the following benefits . 

• Your spellcasting ability score increases by 1. 
• You may Ready a damage spell with the duration of instantaneous outside of combat without a trigger. For every 3 hours that pass without releasing the spell it will be released as if cast a level higher to a maximum of two levels higher than the initial casting. Instead of having a normal reaction and trigger, the caster must use their first action in an encounter to release the spell.
• You may release the spell at any moment before rolling initiate. 

If the spell isn’t released after 12 hours, you become incapacitated or you lose concentration, you release the spell centered upon yourself if it has an AOE, if the spell can target one or more people you become the first target and the DM chooses the other ones, you automatically fail saving throws against this and if it’s a targeting one you are automatically hit. 

(The fireball should be stable)