The bond of the Blade Brothers is very important in the mid-to-late stage. Just like Auto Chess, you can get a significant improvement in attributes after gathering enough hero bonds. Heroes of different types and professions will have different bonds, so it is recommended to choose flexibly.
Warrior : attack power +10/20/30%, health +10/20/30%
Knight : Defense +20/40/70, the knight with the same name is also included in the bond
Mage : Cooling speed +12/24/36%
Demon Hunter : Damage to boss +5%/30%, movement speed +20/60
Hunter : Precision damage +20/40/60%
Assassin : Critical hit rate +12/24/36%
Holy Spirit : At the beginning of the round, there is a 20% chance of obtaining a skill in the activated bond; each Holy Spirit has a 0/60% chance of being upgraded by 1 level.
Monk : Slash damage +24/48%
Artisan : Arcane damage +24/48%
Priest : Investment +80/350, 0/-10% enemy count
Druid : When recruiting a Druid, the level of the Druid obtained is +1, and the level of the Druid that has not yet reached the level is +0/1.
Shaman : Extra damage +20/35%
Warlock : Recovery on hit +25/70, Range +5/10%