Hyper
Unforgiving Avenger is a hyper unique to the avenger role in Co-Op mode. The player can substitute it for their character's hyper card after reaching level 10 with the avenger role. It is a 5-star battle card that effectively gives the user the effects of a max level From Beyond. If the user is KO'd in that battle, they will instead return to 3 HP.
Hyper Strategy
Unforgiving Avenger is designed to synergize with the avenger's passive ability, allowing them to take massive amounts of damage in order to counterattack with a massive ATK boost. This card is best used by characters who have good stats for the avenger role, but have a hyper card that does not synergize with its playstyle or is too restrictive to use. An example would be . The opening to use 
Final Surgery is very narrow, with it only being useful while one or more players are at 1 HP. Some players may prefer to have another way to use From Beyond in the late-game for a final damage push rather than Final Surgery
The downside to using this hyper card is its high norma requirement. While and have many minions that the players can attack to gain wins, the other bosses can be quite difficult to level up against. In addition, many characters that do well in the avenger role already have comparably strong hyper cards that they can play much sooner in the match, such as 
Solid Witch or 
Sweet Guardian.
Trivia
- Unforgiving Avenger formerly had an effect that caused both units to take double damage in the battle where it was played.