Tier 1 units consists of heroes who excel in the current metagame: they are among the strongest in the game and bring overwhelming strength to their respective roles, whether it be offense, defense or support. Many Tier 1 heroes are incredibly powerful and will often wield powerful unique weapons and skills. Many of these heroes have phenomenal matchups against the majority of units.
Tier 2 units are among the strongest in the game. These units will have fantastic matchups against many common threats, making them some of the strongest choices for their role. With resource investment and a synergistic team composition, many of these units can be just as powerful as those in Tier 1.
Tier 3 units are powerful additions to most teams, with great matchups against common units. These heroes are more than capable in their favored roles, and many possess strong stat-lines and powerful unique weapons. Though some heroes in the above tiers tend to offer more advantages, these heroes can perform exceptionally well given the right support.
Tier 4 units are respectable heroes with good matchups against common units. Some of these heroes may be more niche or have less specialised stat distributions than units in the above tiers, or will be more dependant on certain skills, but they can still perform their given role well. Some of these heroes can be somewhat reliant on considerable resource investment, additional merges and a synergistic team composition to perform as well as units in higher tiers.
Tier 5 units have passable match-ups against most units, but tend to struggle to compete against a selection of heroes. These heroes suffer from more prominent weaknesses, demand greater investment, and may be comparatively inferior to units in higher tiers. These heroes are not definitively weak, but are less consistent in most team compositions. Nevertheless, with heavy investment, these heroes can perform adequately.