The 5 Plat is to buy the energy to enter portal, see the 3 green (or black) dots at the top of your screen in game? Those are the energies, you will need use one to enter portal. If you don't have any energy left (no green) you will need to pay 5 Plat to buy the energy to enter. Or you can buy energy from auction for gold or wait 8hr for it to automatically replenish.
Nothing to do with awakening at all
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