1. For the crystal in the same level, low grade crystal will be devoured by high grade one with its total EXP added to high grade crystal.
2. For the crystal in the same grade, low EXP crystal will be devoured by high EXP one with its total EXP added to high EXP crystal.
3. Soul Crystal has its basic EXP that increases with the grade.
4. When devouring, Soul Crystal will devour all overflow EXP if EXP is much more than what it needs to upgrade to the level cap
5. Crystals of the best grade or highest level can’t devour or be devoured.
Total EXP = Basic EXP + Current EXP