It sounds like a Lava Dragon, but a bit weaker. Okay.
Abilities – a few units should have unique abilities, like the Lava Dragon having a lava shield instead of a fire shield, like the ability of the Trolls – Chain Lightning, like the ability of the Bear Riders – a paw strike, like the Berserkers having their berserker rage, like the Mountain Guards having their ability to reduce damage from running... In general, almost all units – at least 5 – should have their own unique abilities that haven't been seen before, but it's extremely difficult to come up with new, original, but appropriate abilities for the Fire faction.
P.S. I write in many topics, and I can't focus on just one – ask other critics, and you'll see that I'm not the only one who thinks this way...
Before thinking about abilities, you need to figure out who will be on level 3 (which I haven't figured out yet), but as it is...
Invisibility – unique
Fire Spit – unique
Fire Shield – seems unique
Resurrection – unique
The Fire Elementals also seemed to have some unique ability...
and finally, you can make a unique ability for level 3
What's next?