Use / To split target simplifier and creature type simplifier.
If you want this skill(Like effect,burn,damage) will just use on Player,You can add /Player after the target simplifier,Like line 1.
If you want use on Camp:Kingdom and SpawnPoint is Kingdom,add /Camp:Kingdom, Point:Kingdom
There's a new file in plugin folder named 'worldRandomSpawn.yml'
If you want to spawn mob randomly in a world,use this.
It means the level named world.Will spawn humanslayer mob.Every player's nearby will spawn.The max amount for every player's nearby is 10.The detect amount distance is 50(player is the centre).The spawn distance is 50(the number bigger,the distance of mob spawn may the far).If the mob of randomSpawn's nearby has no player(Distance is 60),it will kill it self and despawn.The spawn cooldown is 2s.The probability of this mob is 100.00(Here is 10000 = 100.00%,50.00% is 5000)