Well I've basically opened up every Heart chest within the crypt (both flaming chests and red Shao Kahn chests) and now I have so many hearts and have nothing else to spend them on within the Krypt. Will Netherrealm add content within the Krypt where we can spend any hearts left over after all chests are unlocked? The chests requiring hearts don't restock using a Kronosphere nor Kronika's Time Vaults.