The Archer boss in Scorpion Caves has too much hitpoints. We had a group of four good players (skill and fully khitai/t4 geared) and two average, and we could not get him below 10-15%. According to my parse and some math, he has approximately 2,700,000 health, which is more than Louhi in T3. And an enrage timer at 5 minute 40 seconds. I was tanking the boss on my DT, doing 1700-1800 dps, so with a Guardian or Conqueror tanking him, it would be even harder. We kept getting the BS and offtank charmed and they could not do the dps required from them with the buff active. Adjusting the hitpoints a fair bit down or extending the enrage timer by a minute or so would make this boss doable for many more groups.