Tier question

Fairly new to the game. Wondering what the basis of tiers is. Does it increase by character level or quest level?
I think by chracter level or stage level. The more you progress on the game the higher the tiers.
Stages: normal 1 and 2 you get Tier 1 Normal 3 and 4 you get Tier 2 Normal 5 and 6 you get Tier 3 Etc etc (Only know it up to nightmare 7 where you get Tier 9) Shop: Increases with Level, also you can randomly get unique Items from the Sets but need lv 50 to equip them Hope it helped
Stages: normal 1 and 2 you get Tier 1 Normal 3 and 4 you get Tier 2 Normal 5 and 6 you get Tier 3 Etc etc (Only know it up to nightmare 7 where you get Tier 9) Shop: Increases with Level, also you can randomly get unique Items from the Sets but need lv 50 to equip them Hope it helped
I'm up to tier 16 now lol thanks though
Sir Adam what level are you and the difficulty? I'm on tier 15 only
Lv 73. Tier 15
Shop Tier increases all 5 Levels by 1, Cap at tier 15 with the Chance from lvl 1 on to get unique (Tier 16) when buying with souls Hope that answers it
So 15 is the cap. Makes sense to me lol.
Can you explain more further pls?