Stormonu
NeoGrognard
Yeah, it's hard to come up with good mechanics for this one - obviously, it's supposed to represent one desperate all-or-nothing attack where either you take the foe down in one blow or you get chopped down in return.
Perhaps, since you taking it when you get an extra attack, it should dump the extra attack, make it a full-attack action and deal double damage. For every additional 5 levels/BAB, increase the multiplier by x1. Now, you're making one deadly lunge, putting your all into the attack. Leave in the part about the free counterattack afterward (opponent's attack multiplier is one lower), and I think it about balances it.
Death or Glory (Combat)
You're determined that the foe who towers above you is going down first.
Prerequisites: Str 13, Power Attack, BAB 6+
Benefit: Against a creature one size category or more larger than you, you can make a single melee attack as a full-round action. On a hit, you double the damage dealt to the opponent. For every additional +5 to your BAB, you increase the damage multiplier by one. After you resolve you attack, the opponent can spend an immediate action to make a single melee attack against you, with the damage dealt being one multiplier less than your attack (thus, if you attack with a x3 damage multiplier, the opponent attacks with a x2 damage multiplier)
Special: You can combine the full-round action attack this feat allows with the benefit of Vital Strike, Improved Vital Strike or Greater Vital Strike.
Perhaps, since you taking it when you get an extra attack, it should dump the extra attack, make it a full-attack action and deal double damage. For every additional 5 levels/BAB, increase the multiplier by x1. Now, you're making one deadly lunge, putting your all into the attack. Leave in the part about the free counterattack afterward (opponent's attack multiplier is one lower), and I think it about balances it.
Death or Glory (Combat)
You're determined that the foe who towers above you is going down first.
Prerequisites: Str 13, Power Attack, BAB 6+
Benefit: Against a creature one size category or more larger than you, you can make a single melee attack as a full-round action. On a hit, you double the damage dealt to the opponent. For every additional +5 to your BAB, you increase the damage multiplier by one. After you resolve you attack, the opponent can spend an immediate action to make a single melee attack against you, with the damage dealt being one multiplier less than your attack (thus, if you attack with a x3 damage multiplier, the opponent attacks with a x2 damage multiplier)
Special: You can combine the full-round action attack this feat allows with the benefit of Vital Strike, Improved Vital Strike or Greater Vital Strike.