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All or Nothing (D20 Modern Feat)
From D&D Wiki
All or Nothing
You are willing to sacrifice your own safety, and throw yourself into an all-out, last ditch melee attack.
Prerequisite: BAB +4.
Benefit: Whenever you make a full attack, you can make it an all or nothing attack. You receive an additional melee strike at your highest base attack bonus. However, you lose one full action on your next initiative turn, and suffer a -4 circumstance penalty to Defense until you are able to perform another action.