You can now modify some units and spells. Here are some examples of the modifiers you can use:
Demon Breakers cleave radius from 1 to 4, but they cannot spawn skeletons from Demon Synergy.
Elven Archers have magic projectiles that switch target if its current target dies, but if an Elven Archer dies a random Elven Archer also dies.
Rain of Death hits a larger area, but also damages your own hero and units.
Summon Melee now summons Spiders, Demon Breakers, Demon Commanders, Paladins and Moon Riders.
All modifiers unlock once you have survived endgame round 3 with Sicaria. There are currently 8 modifiers in total, and I would like to add more if I find some good ideas. I hope this opens up for some new fun strategies.
Also an upcoming game where I have been involved with testing and feedback is my friend Martin's game Greed Forest, you can check out the demo here: View game page