Your idea is very interesting
How much would it cost if the effect of Damage is linked to the Feature?
I choose an effect of Damage, ranged with alternate save (fortitude) and limited on living creatures. This has a cost of 2 power point per rank; Feature has a cost of 1 power point per rank (although I don't understand the significance of rank within the Feature).
When I link Damage and Feature, the total power point needed would be 3 per rank?