The rewards for the ones that will be released later are pretty damn good though.
HR 22 - Legwand Gem (Boosts Atk, Def, Rec, and max HP by 25%).
HR 23 - Magic Ore (Increases BB gauge after every turn - 4 BC).
HR 24 - Sphere Frog.
HR 25 - Malice Jewel (Boosts Atk, Def, Rec, and max HP by 30%).
HR 26 - Demon Core (Boosts BB gauge when attacking (3-4 BC), taking damage (2-3 BC), slaying foes (3-5 BC), and victory (5-7 BC)).
HR 27 - Divine Blade (100% attack and defense boost for first 2 turns).
HR 28 - 3x Sphere Frog.
HR 29 - Heavenly Bud (100% damage increase during spark).
HR 30 - (Status immunity, BB gauge and HP increases after every turn).
HR 31 - 5* Tesura.
HR 32 - 2x Burst Emperor (Boost BB level significantly when fused).
HR 33 - (Increase attack and defense by 100% for the first 4 turns).
HR 34 - 3x All Imp Alton (Boost all stats significantly when fused).
HR 35 - Buffer Jewel (Boost attack, defense, recovery, and max HP by 35%).
HR 36 - (When BB gauge is full increase attack, defense, and recovery and boost in damage during spark).