Iconoclash: Battlegrounds is a stand-alone expansion and features 4 new, original fighters for the Iconoclash system:

Valiant Knight: Press-your-luck with every attack! The Valiant Knight commands an army of champions, and his attack deals more when he draws well from his Valiant Token Bag. But with every draw you risk the attack with a chance he may weaken his attacks or cause them to fail altogether.
Amelia Fortress: Ready to take command of the fight? The undauntable commander of the 6th Armored Brigade will pulverize her opponents with her heavily armed mecha. She tends to pull off her greatest maneuvers when she's on the ropes and has only a handful of options.
Monarch: Prepare to take flight and control the skies! Monarch readies her lance from above to deal extra damage. Monarch will use her magnificent wings to create great gusts and push everything on the board.
Kali: Put on your uwu face! Kali commands an army of alien kittens that she uses to create an adorable minefield. Or she can collect them to create an explosion of kitten power.
In Iconoclash: Battlegrounds you’ll take the fight to the Final Battlefield and the Fallen Field where great battles in ages past have been fought.