Patch Available - GMS 1.50

How badly? And what about HoH mobs?

Ancient Golem: HP: 49,000,000 → 13,056,000, EXP: 123,308 → 60,857
Ancient Dark Golem: HP: 50,000,000 → 13,502,400, EXP: 127,733 → 62,650
Ancient Mixed Golem: HP: 51,000,000 → 13,955,200, EXP: 130,514 → 64,640

Advanced Knight A: HP: 25,000,000 → 6,270,000, EXP: 104,529 → 25,550
Advanced Knight B: HP: 26,000,000 → 6,666,400, EXP: 108,043 → 26,865
Advanced Knight C: HP: 26,500,000 → 6,868,800, EXP: 109,786 → 27,574
Advanced Knight D: HP: 28,500,000 → 7,546,800, EXP: 117,271 → 30,046
Advanced Knight E: HP: 30,500,000 → 8,259,400, EXP: 124,671 → 32,568

All of the mobs count as normal mobs now.
Also, there were absolutely no changes to non-KMS mobs from what I've seen.