Berserker Rage: (Total: 150 Active Cost, 48 Real Cost) Physical Damage Reduction, 75% (40 Active Points); Side Effects, Side Effect occurs automatically whenever Power is used (Knocked Unconscious After The Rage Is Over; -1), Limited Power Only Work When Enraged (-1/2), Costs Endurance (-1/2), Increased Endurance Cost (x2 END; -1/2), Linked (Knockback Resistance; -1/4) (Real Cost: 11) plus +5 with All Combat (40 Active Points); Side Effects, Side Effect occurs automatically whenever Power is used (Knocked Unconscious After The Rage Is Over; -1), Limited Power Only Work When Enraged (-1/2), Linked (Power Defense; -1/4) (Real Cost: 14) plus Knockback Resistance -10" (20 Active Points); Side Effects, Side Effect occurs automatically whenever Power is used (Knocked Unconscious After The Rage Is Over; -1), Linked (Damage Reduction; -1/2), Limited Power Only Work When Enraged (-1/2) (Real Cost: 7) plus +10 Mental Defense (12 points total) (10 Active Points); Side Effects, Side Effect occurs automatically whenever Power is used (Knocked Unconscious After The Rage Is Over; -1), Linked (Damage Reduction; -1/2), Limited Power Only Work When Enraged (-1/2) (Real Cost: 3) plus Power Defense (10 points) (10 Active Points); Side Effects, Side Effect occurs automatically whenever Power is used (Knocked Unconscious After The Rage Is Over; -1), Linked (Knockback Resistance; -1/2), Limited Power Only Work When Enraged (-1/2) (Real Cost: 3) plus Mental Damage Reduction, 50% (30 Active Points); Side Effects, Side Effect occurs automatically whenever Power is used (Knocked Unconscious After The Rage Is Over; -1), Linked (Damage Reduction; -1/2), Limited Power Only Work When Enraged (-1/2) (Real Cost: 10).
Now it cost 8 END per phase, which I think is reasonable (the power should be strained for the user).