Kishin currently increases by 70% the amount of mobs in the map, and decreases the respaw time to 3s.
The decent kishin would start by increasing 30% the amount of mobs and would have the same 3s of respaw, at level 1, and lv 25 would increase by 50% the amount of mobs and would have the same 3s of respaw.
Currently after lv 200 , make money in reboot is very difficult because even killing the mobs in 1 hit, which requires a high range, the amount of mesos that they drop is low, therefore it is necessary for the player to have a meso gear, it would cost about 3b ~ 5b to make one.
But players arriving on the arcane river can not farm to make the character stronger, and still need to make the meso gear.
So most players create a secondary character, a kanna to farm. For even with the meso gear and killing the monsters in 1 hit, without a kanna the mesos rate in arcane river is low compared to the amount of mesos that the player needs to evolve.
A lv 240 with 100% mesos in arcana without kishin does in average 150m / h, while the same player with kishin reaches 400m / h. A good average for the start (lv 200) would be 150m / h, but a lv 220+ needs a lot more mesos to evolve in the game.
There is also the fact that classes currently clean the map very fast and having to wait about 2-3 seconds until the mobs respawn which leaves the gameplay very slow and tedious.
I think this is a wrong mechanic because the progression of the game should be focused on the main character, so the decent kishin would help because you would have a good progression in the main character, without needing 2 computers.
This would also alleviate the amount of online players on the servers.
I believe that this would be the best solution that would please the players and would not adversely affect the game.