Wath is tne use to have an another Hero gain a ''Valor token''. Since the only Champion in play is your Hero.

i havent played the champion class myself but i had one guy in the party i was playing against (me as the overlord

it says somewhere what you can use the tokens for, then a skill grants you the ability to give them to someone else i think, or the ability states that the person you give a valor token to can use it for either +1 damage or +1 defense.

try and read through the Champion abilities, it should make sense

The Champion is not the only class that can spend valor tokens. He's the only class that can generate valor tokens, but any hero who has one can spend it on the listed effects.

Think of the Champion as a kind of middle-man. If you have a valor token you can cash it in to use certain Champion abilities. He kind of extends your skill set.