There are various cards that give you energy, e.g. Pendant of Ragnor or Vampiric Crown
These cards should not give you more energy than your current storage allows - so if e.g. you have Bespelled Grimoire in play, any card that gives you more than 10 energy is capped to giving you 10 energy. If you have one of the expansion cards that reduces your total by 1, no card can give you more than 6.
This doesn't change gameplay, since you will have to discard the extras as soon as you get them, but will make situations where the Crown draws Runic Cube of Eolis (and gives you 30 energy) less annoying.
These cards should not give you more energy than your current storage allows - so if e.g. you have Bespelled Grimoire in play, any card that gives you more than 10 energy is capped to giving you 10 energy. If you have one of the expansion cards that reduces your total by 1, no card can give you more than 6.
This doesn't change gameplay, since you will have to discard the extras as soon as you get them, but will make situations where the Crown draws Runic Cube of Eolis (and gives you 30 energy) less annoying.