All they really need to do in order to rebalance the ability is lower the focus cost.
The current power level is appropriate for a PL3 or PL4 cipher ability, but it costs 80 focus to cast.
A refund like how the chanter ability "Far from defeated, his heart filled with joy", which refunds half the resource cost would be perfect.
So it would cost 80 focus to cast, then it would refund you 40 right afterwards.