For more information on the Vitality Reserve Advantage, see this page of the GURPS FAQ.

Battle Transformation [140] 
    DR 4 [3] 
        Tough Skin [-40%] 
    DX+4 [44] 
    HT+4 [22] 
    Extra Attack [13.75] 
    Striking ST 8 [22] 
    Lifting ST 8 [13.2] 
    Vitality Reserve 20 [22] 
    Temporary Disadvantage [-15%] 
        Berserk (12 or less) [-15] 
            Battle Rage [+50%] 
    Magical [-10%] 
    Spell Components [-20%] 
        Must say "warrior" in Latin 
        Must gesture with hands 
Level 2-5 [154/168/182/196] 
    Increase DR by 4 [3] 
    Increase Vitality Reserve by 10 [11]