Dude it all depends on the options that ur particular set posseses..like evasion, magic evasion, critical hit evasion, critical hit rate, etc..
So a lvl 110+ warrior can go out of pots killing c3 boss if they have no options on their set..
The following are just approximates..
For R4 Boss (Di Phameino) :-
Hk - lvl 93-100
Warrior - lvl 90-100
Mage - 108+
Archer - No Idea
C3/S2 (Arr/Forn Khalliash) :-
Hk - lvl 110 - 115
Warrior - lvl 110 - 115
Mage - Can't say ..
Archer - 115+
S3/S4 Phameinos :-
Must be 120+ with Gud options on set..or else RIP
That shud suffice u ...
IGN :
Darksoul Lvl 126 Mace Hk (
Temoz)