"Educated Guess" values have been recorded from Corecraft test server which isn't a primary source (credit for that research goes to NiM and Shiro). However, when I've tried to verify some of their values now and in the past, they've come out pretty much right and in my opinion are preferable to any guessed values and can be used for the time being until primary sources are studied.
Mob
Damage
Health
Mana
Abilities
Immunities
Source
Comments
Rift Lord
2800-3600
86172
0
Frenzy at 20-30% for 60% attack speed, Mortal Strike for 250% damage, Hamstring for 20% damage, Knockdown for 10% damage, Sunder Armor, Thunderclap for 2550-3450
?
Educated Guess
They appear to come with two possible sets of abilities: Hamstring/Knockdown/Mortal Strike (1) and Sunder Armor/Thunder clap (2. 2.4.0 patch notes mention decreased health for Rift Lords and Keepers and these are at 2.4.3 values, but the patch notes don't say if it was for normal, heroic or both)
Rift Keeper
2500-3200
68928
32310
Curse of Vulnerability, Frostbolt, Shadow Bolt Volley for 4680-5720, Blast Wave, Pyroblast, Fear, Polymorph, Enrage
There appears to be a mage and warlock types: one with frostbolt/pyroblast/blast wave/polymorph and one with Curse of Vulnerability/Fear/Shadow Bolt Volley. 2.2.0 patch notes mention Shadow Bolt Volley damage being reduced (to 2925-3575) but I can't find a source for original values other than that they must have been more
Arcane Blast for 4500-5500, Time Lapse, Arcane Discharge for 3700-4300, Banish Dragon Helper
Immune
Educated Guess
Spawns instead of Chrono-Lord Deja if you've already killed him. Np rep.
Temporus
4200-5800
147600
0
Spell Reflection for 8s (2.1.0 patch changed it to 6s), Mortal Wound (stacking 10 times, changed to 7 in 2.2.0), Hasten, Wing Buffet for 1875-3125, Banish Dragon Helper
Immune
Educated Guess
N/A
Infinite Timereaver
4200-5800
147600
0
Spell Reflection for 8s (2.1.0 patch changed it to 6s), Mortal Wound (stacking 10 times, changed to 7 in 2.2.0), Hasten, Wing Buffet for 1875-3125, Banish Dragon Helper
Immune
Educated Guess
Appears if you've already killed Temporus. No rep
Aeonus
5200-7600
1999620
0
Enrage, Time Stop, Cleave for 110%, Banish Dragon Helper, Sand Breath for 4700-5400
"Educated Guess" values have been recorded from Corecraft test server which isn't a primary source (credit for that research goes to NiM and Shiro). However, when I've tried to verify some of their values now and in the past, they've come out pretty much right and in my opinion are preferable to any guessed values and can be used for the time being until primary sources are studied.