Player > Feats > Periastra Training
Through sheer force of will, you can gain the effects of being fully attuned to your current stellar mode.
Cha 13, Mysticism 5 ranks, stellar mode class feature.
When you have 1 or 2 attunement points and use a stellar revelation, you can spend 1 Resolve Point to use that revelation as if you were fully attuned to your current mode. You cannot benefit from this feat if you have disproportionate revelations.
Edited Sep 6th, 2019 here