A small QoL improvement.
There is a good number of cores you can’t extract but all of them can be made to charm. Veteran players know them by heart but it’s a hassle to remember them.
It would be nice to have a warning window before sacrificing a core for the purpose of extracting more of them, probably with the message saying the reason, so the player knows they can summon one and sacrifice one for charm in case it’s a common monster.
- you won’t be able to extract the core from this monster because it is special.
- you won’t be able to extract the core from this monster because it is protected by unearthly force.
- you won’t be able to extract the core from this monster before summoning, breeding one.