Hello, I would like to give some feedback on Thurnus. He is not a tanker, so using a skill with a range of 1 square to hit 3 targets is very difficult. This skill is almost never activated during my experience with him.
Furthermore, the rewards when activated are very small compared to Martina's battle skill, which only requires hitting 2 targets to receive rally and crit AOE.
My suggestion is to reduce the bonus attack to 10%, but remove the activation condition. The reason is that Thurnus's skill set is already oriented towards single-target boss fights, and it would be illogical for a single-target hero to require multiple targets to activate the skill effect.
In addition, hitting 3 targets within a 1-square range is very challenging, even for a tanker, let alone Thurnus, who is not a tanker!!