I was thinking about changing the use of relics. I think that if the relics had the ability to have different perks according to the type of monster that has it equipped there could be more variety of combinations. One way to assign a different perks to each relic according to the type of monster could be based on the book or element to which the monster belongs.monsters that have more than one book or element can choose only one of the available options of each relic.
this change could eliminate the restricted use of the pre-assigned relic slot for each monster. because the current restricted use of relic slot leaves little room for more combinations and creativity of different strategies.