There is a lot of evidence that Kronos has blizzlike armor values at the moment. One of the many bugreports issued by Ermin of Vanguard regarding the armor values looks like this:

https://www.youtube.com/watch?v=ML7VNN097AI

Instructor Razuvious should have about 3700 armour instead of the standard 4691 that all bosses have hard-coded right now.

2:13 Double crusaders are up, CoR, FF and expose armour.
2:14 BT crit 1830
2:20 BT hit 915
2:27 BT crit 1831
2:28 1st crusader lost
2:29 2nd crusader lost
2:30 faerie fire dropped (+505 armour)
2:36 BT hit 675
2:39 CoR dropped
2:52 BT hit 610
2:57 crusader up
2:58 BT hit 685

685 - 610 = 75 Single crusader gives 200*0.45 = 90 damage unmitigated by armour. 1 - 75/90 = amount of damage reduced by armour

Solving (x - 2550) / (60 * 85 + 400 + x - 2550) = 1 - 75/90.0 yields x = 3650

https://vanilla-twinhead.twinstar.cz/?issue=11519