You could always increase the death time depending on the last time they died or something, instead of having them go to a box room when they die they could go to a nice place where they could train but couldn't use jutsu or anything as they would be dead. but dues to being able to traint here the logs would either give stats at a much reduced rate or break easily compaired to normal ones. just an idea. to leave ane be alive again then they'd just go tot eh edge of where ever they are like,
-----Had a little map thingy here but it came out horrible so I deleted it
Or something, i'm not good at mapping so yea if it were nice and pretty then maybe people would want to stay longer