Soul Durability
Soul has 90 Durability when it's summoned.
When you claim the chest with your Soul, 1 Durability is consumed.
You can't claim any chest with 0 Durability.
Then you need to recharge the Durability from Soul List.
You consume 100 RAYS to recharge 1 Durability.
You can recharge it anytime, but the Durability should be max (90 Durability) after recharging.