Apparently the game doesn't even tell you when you get in Check. For a game where protecting a unit is super-important (and originally, mandatory), not knowing half the time that its even threatened is fatal.
Alright, elemental penetration doesn't work. I got 20% penetration along with 60-75% chances on all elements, and saw precisely ZERO elemental effects on the universal enemies I had added the penetration to fight against.
Can the auto-skip feature be disabled on boss waves? The main issue with it is that since the boss is only 1 enemy, it auto-skips and leaves you with dozens of enemies supporting the boss.