Think you can get tempered runs as low as HR14 but I'm I'm still tucked in bed with laptop and refuse to get out right now..Z_Z
I think it goes...monsters difficulty ; normal -- Tempered (attack patterns same as normal but more HP/DEF/STR) -- Arch Tempered (more HP/STR new attacks than Tempered).
Arch Tempered also have a slight pale almost silvery shiny coating that makes them look somewhat metallic to them.
Oh the distinction is quite easy
Arch Tempered monsters can only be fought as event quests and only include the elder dragons.
They will have an orange outline instead of purple
Oh, yes, after having fought a couple of event quest it dawned to me that's probably the difference.
But tbh I don't think the difference is *that* big, I played a HR50 Kushala investigation and he did a lot of stuff I didn't see before, and whilst we killed him fast in the end, during the fight I thought this'll never end due to how hard it was to hit him...