remove repeated label

combat.tex

@@ -703,8 +703,6 @@ Attacks against a \textit{Prone} target gain a +2 bonus.
 However, they can get up as by spending 1 \gls{ap}.
 
 \subsubsection[+1 to attack]{Higher Ground}
-\index{Prone}
-\label{prone}
 
 Gaining the higher ground grants +1 to the Attack Bonus, as you target the enemy's head easier and gravity aids your downward swings.