how to enable farm area ?

I want activate farm area, in farm area there is monster (semi raid) which that monster drop glittering medals

What is the problem and what do you want to achieve exactly ?

//spawn YourCustomMonsterId

my server is PvP and in this game glittering medals is not dropping, I want set it

You can edit the drop in the npc's xml files at xml/npc.
Take a look at the

Code:

<rewardlist type="RATED_GROUPED">

- The <group chance="a"> is the chance of getting the items in that group.
- The <reward item_id="x" min="y" max="z" chance="b"/> is the item x dropped. The quantity is between y and z. The chance b should be the chance for individual item.
So find your desired mob id and item id, add them manual there. Go in-game and spawn some of them to test ^_^
Hope this helps!