The boss fights against the Engineer and Shaxthal Deathbringer Alpha both require rebalancing to offset Elynia and Elyssa's ridiculous stats at that point, as well as the Fire Guardians'. In particular, the Engineer could use the ability to consistently recruit or spawn units to make the player's life more difficult.
Spoilers ahead.
The boss fights against the Engineer and Shaxthal Deathbringer Alpha both require rebalancing to offset Elynia and Elyssa's ridiculous stats at that point, as well as the Fire Guardians'. In particular, the Engineer could use the ability to consistently recruit or spawn units to make the player's life more difficult.