When missions like Iron missions and similar comes to an end, there will be way harder
to increase attributes.
At least as it looks atm. Maybe we will get other kind of missions where the reward is
attribute token.

So an adition to gain attribute tokens could be five daily mission, one for each sort.
Reward should be one token per day and sort.
This way hardcore grinders will have some increase, and those who have uneven amount
can even them out and get some more attributes.