First, this should be in script support, the next time you post this kind of topic, put it there
or maybe i'm wrong, i'm used to the forum i always use, there is no script request there...
To set separate reward, look here
OnInit:
setarray .Castles$[0],
"prtg_cas01","prtg_cas02","prtg_cas03","prtg_cas04","prtg_cas05",
"payg_cas01","payg_cas02","payg_cas03","payg_cas04","payg_cas05",
"gefg_cas01","gefg_cas02","gefg_cas03","gefg_cas04","gefg_cas05",
"aldeg_cas01","aldeg_cas02","aldeg_cas03","aldeg_cas04","aldeg_cas05",
"arug_cas01","arug_cas02","arug_cas03","arug_cas04","arug_cas05",
"schg_cas01","schg_cas02","schg_cas03","schg_cas04","schg_cas05";
add this on the next line and keep end; at the bottom, also change all castle maps in quotes to your item ids as i put 7227 there without quote.
setarray .Rewards[0],
7227,"prtg_cas02","prtg_cas03","prtg_cas04","prtg_cas05",
"payg_cas01","payg_cas02","payg_cas03","payg_cas04","payg_cas05",
"gefg_cas01","gefg_cas02","gefg_cas03","gefg_cas04","gefg_cas05",
"aldeg_cas01","aldeg_cas02","aldeg_cas03","aldeg_cas04","aldeg_cas05",
"arug_cas01","arug_cas02","arug_cas03","arug_cas04","arug_cas05",
"schg_cas01","schg_cas02","schg_cas03","schg_cas04","schg_cas05";
then at this line
getitem 7227,50; //Set your prize here!
//change it to
getitem .Rewards[.@i],50;