Rhino armour is an opportunity to provide an interesting choice to the player! An armour set with pros and cons.

Pros:

• Decent armour value (less than diamond still).
• Knockback resistance (25% per armour piece). Full set makes you completely immune to knockback of any kind.
• High armour toughness.

Cons:

• Each piece you wear adds slowness of some sort? Not sure if we can properly layer this. If not:
  1 piece = slow 1
  2-3 pieces = slow 2
  full set = slow 3

Something like that.

Anyhow, this armour could be used to counter e.g. bosses that knock you around a ton, but it makes it harder to dodge things. Give and take and all.