add berserker knack

knacks.tex

@@ -18,6 +18,12 @@ Adrenaline surge can be used once each scene for each knack the character has, a
 You are particularly difficult to flank. So long as you are not surrounded on all four sides you receive no penalty for being Flanked.
 See page \pageref{flank} for rules on flanking.
 
+\subsubsection{Berserker}
+
+You enter a bloodthirsty rage when in battle.
+After the first round, you gain a +1 bonus to Speed.
+After the second round, you gain a +1 bonus to Strength.
+
 \subsubsection{Brawler}
 
 The character receives +2 to Strike when making unarmed attacks or grappling.