Perhaps consider something along these lines? Rationale:
* I think it's reasonable to allow flexibility on skills chosen, though as is always the case, the group should judge the appropriateness of the choice. (Ie, I would probably respond with a firm 'No' to the suggestion that Resources would be appropriate, unless the person came up with an absolutely amazing justification.)
* If defined as a melee weapon, it should be allowed to do defensive melee actions for no extra charge.
* Using Evocation as a baseline, 'zonewide' is treated as a two-shift effect. While I'd be reluctant to make it a baseline capability via a -2 penalty, it is probably reasonable as a -1 power option with no additional penalty.
NATURAL WEAPONRY [-1]
Description: Your body containscan naturally (or supernaturally) generate some kind of weapon or attack.
Note: You have to pick one type of weapon (eg. fire breath, metal claws, three-foot tusks) when you take this power.
Skills Affected: Choose a skill to represent your expertise with this form of attack (skill chosen must be approved by the table); typical examples include: Fists, Weapons, Guns
Effects:
Natural Weaponry. Your body contains a weapon/attack is treated as a melee weapon with a rating of 2. This weapon has a no range, is not capable of spray attacks, does benefits from Strength powers, can be used defensively (if appropriate to its nature), and is wielded with the Fistschosen skill.
Potent Weaponry [-1]. Your natural weapon has a rating of 4.
Defensive Weaponry [-1]. Your natural weapon may be wielded with Weapons and used with the defence trapping of that skill.
Ranged Weaponry [-1]. Your natural weapon has a range of one zone and (if appropriate to its nature) is capable of spray attacks, but can no longer be used defensively.. It may be wielded with the Fists, Weapons, or Guns skill. It cannot be used with the defence trapping of Weapons.
Long-Range Weaponry [-1]. (Requires Ranged Weaponry) Your natural weapon has a range of three zones.
Area Weaponry [-1]. (Requires Ranged Weaponry) Your natural weapon may be used to make zonewide attacks at a -2 no penalty.
Superior Area Weaponry [-1]. (Requires Area Weaponry) You suffer no penalty when making zonewide attacks with your natural weapon.