Runic Blade being available, as it works now, in Arena is broken.
Yes, the only real uses of heroes (that I see) are:
- Archer or Assassin insta-kills in skull spam teams
- Mechanist class to give mana to Bombots
- Warden class to count as Beast with a Forest Guardian build
- occasional Sorcerer with AoE weapon or a true damage build
...and the only one that is consistent and viable (i.e. not simply outclassed by troops in similar or better builds) is the Mechanist Bombot trick for farming challenges.
Shame, as the hero should 'represent' the player, and show the individuality / identity in game more: that'd also probably sell more cosmetic stuff.