LogFAQs > #946073190

4th boss is pretty nasty, not gonna lie. He gains the ability to self heal from grabby green pots, has a third phase with obscured vision, summons Cerberus, and gains the ability to throw his spear and then dash to it a la Achilles. It's honestly rougher than getting two ranks in the "armored foes get elite perks" or some combo of damage control+tight deadline+jury summons+higher cost.

If your goal is highest possible heat complete, put off rank 4 Extreme Measures as much as you can. I personally like it for the practice and difficulty; stuff like jury summons and higher charon cost is just... boring.
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