Who plays with which heroes in the Inferno faction?

Yes, but I repeat once again that Nimues has a better future! :) Has anyone maxed out the Hellhound? I'm just curious what it excels at when fully upgraded.

I upgraded Groll quite well (in my opinion):
1.
Starting with Chaos magic is a bit strange for a demon, but there's a great ability there: "Withering Flame," which deals +50% damage – that's a powerful skill. Also, it's a good idea to build a guild quickly to protect the weak starting army from strong neutrals (at the beginning), for example, with Fireball or Ice Bolt.
2.
We upgrade attack and offense with tactics: the hounds run further. And if you add boots with +1 to speed, it's even better... And here, there's also acceleration. More speed = the hounds move more often, and not just them:)
3.
You can try to get luck and defense:
1) Soldier's Luck = the Hellfire ability is used more often (it seems to be related to luck) + wider gates.
2) You can enhance Hellfire by taking Reflection = Fire Retribution is very effective. There's also resistance to take, which won't hurt +2 to defense (good).
Result: the army is strengthened due to luck, and it becomes a little stronger due to defense.
4. I didn't upgrade it further... only to level 26-27.
The only problem when playing as Groll is that you need to protect the hounds, because they are always targeted.

Added after 10 minutes
I myself play as MARBAS. Starting with the Defense skill really helps the infantry. I almost always try to upgrade to Stone Skin +9 to defense, which is really cool for the infantry. I get attack and mechanics = faster ballista + fire arrows. Although it's better to get the tent faster than the ballista. Then you can, or maybe you should, get Darkness with Weakening Blow and something else to your liking from Darkness. The result is a pretty good demon. (The chance of all skills dropping is no lower than 8%:smile44:)