Tier 3 is for players rank 16+ till 30(?).
At the lower end of the bracket player rank is boosted to 36 to reduce power gaps.
Keep guards are rank 30 champs.
I wonder whether it is intentional, that low rank players are 1-shotted by npc despite their bolster. Currently NPC totally ignore the bolstered rank and hit you with your true rank, e.g. rank 16 against rank 30 champs.
For me this feels wrong.
What is your opinion?
