The game needs one.... Don't care if it's unattainable or not. 500 biles, 10k skills w/e.
The uncertainty is a bit annoying when competing against older players while questioning whether you can compete combatively.
After introducing a Hard-cap; you then could then introduce a visual indication of what stronger bile players appear as. FI:
Black Bile: Head becomes bigger.
Yellow Bile: Arms become toned.
Plague: Legs and shoulders become toned.
Blood: Torso becomes toned.
Maxed characters could then have a saints glow or horns to display their achievement, or they could simply stop short by 1 point to hide it. The indications could begin obvious to ward new players against experienced ones, but becomes less noticeable further down the line unless the player chooses to run around naked. Highly intelligent players could have growing white hair that they could grow or dye with ea rank. Around 400 bile it could just become strait white. Yellow bile arms become progressively more vainy, as with legs for plague. And the torso just protrude more and more.