some suggestion.
1.Buff can be debuff by self. E.g.magic cell if get attack by enemy,maybe it left last 1 block,but you can't recast again.You need to hit by other/mob to make the block finish.It is quite inconvinence,so it would be better set it can be debuff by self for recasting.
2.All buff be showing remaining time.Some of the skill like camaoflage/dodge would be disappear when on the way to enemy base,so it should be showing remaining time.
3.Introduce new pk system.
New fame rate
Non E - attack and defence increase 27% only can eat small pot
E1-attack and defence increase 24% only can eat small pot
E2-attack and defence increase 21% only can eat small pot
E3-attack and defence increase 18% only can eat small pot
E4-attack and defence increase 15% only can eat small and middle pot
E5-attack and defence increase 12% only can eat small and middle pot
E6-attack and defence increase 9% only can eat small and middle pot
E7-attack and defence increase 6% can eat all kind of pot
E8-attack and defence increase 3% can eat all kind of pot
E9-attack and defence increase 0% can eat all kind of pot
If compare to the fame system existing,the high fame can be kill a low fame player by easy.This system is to make high fame player won't deal too much dmg on low fame player,and low fame player won't be attack high fame player as a rock.It could make all player in same position to fight,even a low fame player have chance to fight win a high fame player,base on you skill.Maybe you will say the low fame player will hit high fame much a bit,but high fame player can eat the large pot,so it is fair.
4.Autobalance system
Every 7 more player in one side will increase 3% attack and defence in other side,maximum 15%.
5.Introduce new medal item
Increasing top weapon (500k medal),+8 service (500k medal),fire,ice,electric,lightning,poison,earth element pot (increasing mage/rune skill attack),frozen pot(specify to archer,have chance to decrease enemy moving speed),fatal poison pot (specify to sin/shadow,melee attack have chance to make enemy poison 500hp/second),berserk pot (increase attack decrease defence),holy pot (increase the healing point of healer skill can heal),and others.All arena pot with same cold down time,expect for medal hp/mp tonic pot.Medal pot effect can existing 1 only,if you use other kind of medal pot,the previous effect will losing.All arena pot only have large pot(2000medal/pcs).
6.New Edin Map
Make the Edin as the main town of both side.Removing all mob at map 3 and place few type of mob around edin.
Edin structure
1 : human safe base : The place protect human attack from akkan.In safe base enemy deal no damage on human.Once human attack akkan in human safe base,it would change to battle mode,that mean akkan can attack you at the same time.When you are battle mode in yourself safe base,10 second if you no attack enemy/receive any attack,it will auto became immune mode (G status).
2 : akkan safe base : Function same with human safe base.
3 : sky rocket area
4 : Tower.Introducing the tower war everyday 8.00pm-10pm.Other time tower auto be neutral.Triangle 3 corner represent the 3 tower,make sure the distance between 3 tower is nearby,but won't getting hit by skyrocket at the same time.Make the tower x5/x10 hp if compare to arena tower and defence high than arena tower.The races who conque the tower each can receive 50 fame and medal per minit.If conque 3 tower that mean 150 fame and medal per minit.Player can use tower to change medal item.
Above is suggestion i can give.All player have chance to have top item if you are hardworking earning medal to change it,no need any more wasting time to change it and can prevent player sell weapon in RM.In armor side,GM can inrease 4/5 defense if compare to normal armor to approach player buy it in order make sure server can continue operate.