While on the subject of heroes, a related question...
When Counter 90 hits, plenty of your units become barbs, but you keep your heroes.
When Counter 100 hits, many of your units go to the afterlife, and you lose one or more of your heroes.
Is this culling of units/heroes random?
The reason I say this is that I had two heroes: Basium (with his 344 XP) and Typhoid Mary. I was a little dismayed when I lost Basium and kept Typhoid Mary. In one game I was left with only the Trojan Horse.
Also, I have had 6 heroes as well when you count the Trojan Horse - Baron, Typhoid Mary, Trojan Horse, Gilden Silveric, Kithra, and Yvain. I lost three at Counter 100.