What will cause this bar to fill up?
Just levelling all the classes or do traits and perks have to be completed too?
Just battles with that class. Those will unlock perks and eventually the uber-weapon.
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Ahh ok - so it is showing the progress towards achieving the special weapon at 250 victories using that hero class.
Thanks 
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Also note, you don’t have to have your hero in the battles. Just have that class unlocked and selected.
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Oh…sweet…thanks for adding that 
And ‘20’ refers to your hero class level, not the number of battles. 
That much I did get lol…thanks
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