<Snipped quote by BCTheEntity>
I'm in two minds about that. On the one hand having an ability which uses your comparatively high Defence would call for a high cost, but on the other hand since you have no way of attacking without using the ability then a low cost would seem appropriate.
Hedging my bets I'd say a cost of 5 would be best, since you could attack in the first and second round, but then would have to wait until the sixth round before gathering enough energy to attack again, but with the provision that you couldn't use your shields to defend yourself with on the same turn, use you'd be lowering your guard to make the attack.
You could also give yourself a subsequent ability like 'Charge Up: Divert all power to energy generation, gaining an extra +1 Energy this round' in order to allow you to attack more often while using your defending rounds for something other than spectating. Or just take a basic +1 Energy regeneration trait for the same effect, although I'd expect @Behemoth542 to put a higher XP cost on something like that.
1. I mean, nothing's stopping anybody else from using their shields to attack, barring their not actually having shields. Hell, they were used for smashing people's heads in all the time IRL; it's a big heavy chunk of metal, that thing's probably going to crack somebody's skull open if it connects.
2. I mean, I've fluffed Metar as being absurdly slow for some reason... maybe he abruptly gains a burst of speed out of nowhere after this round. Possibly because he actually acquires Attack, therefore enough strength to actually move quickly in his ridiculous amounts of armour. What point was I making again? Oh yeah; I feel like a shield bash of that sort wouldn't necessarily need to lower his guard. An attack using a high Defense stat is no more absurd than an attack that completely ignores a target's Defense, after all; it just so happens that Metar is completely focused in Defense, which obviously has massive drawbacks in other notable areas.
3. Oh, by the way, I may tack on a few Attack and/or Health points just for the sake of appearances. Or I may stick to Defense entirely, since I doubt a tiny number of attack points will make much difference at a later point in time.
4. I think more Energy regen will be beneficial to everybody, if every special ability costs less than 10 Energy to use. Just putting that out there.