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ok this is a simple trick but it may help people and dosen't have many requirements.
requirements:
1)cave of ordeal in thedark assembly
2)a character which can pass the request for the cave of ordeal
3)male warrior or a similer character with more then 3 distance throw
4)mage or a bow user
5)high defenc eisa pluse if you cna't pull this off in one turn
6)any character with atleast 6 movement morre is nice

ok now lets get down to it.

pass the cave of ordeal in the dark assembly i got the option after the tornament but you may get it earlier. it usaly has a 40%-51% chance of being passed with 10 felonies so bring hard liqour and chloraform. after this is passed enter cave of ordeal 1 there will be 8 lvl60 master archerss on top on geopanels that give 20% healing and +1attack and a few others.
when you first enetr the stage your target is the first geostone you see have the person with 3 or more throw to throw adell down and have adell walk tot he stone he is now in strikeing range attack if the stone os not destroid use the mage or archers till it is this will cause a masive geo chain that lowers all the archers hp to anywhere between 88-200 now have rozalin throw the person with 6 or more movement tword one of the 2 geo stones left they give the exp+50% boost and there are two of them so +100% exp ona lvl 60 with few hp with this in place you cna get a lvl 1 to lvl50+ in about two or three runs and when your character is level 90-100 every 4 peopel the person kills gives you one level this stage is perfect for leveling up mages and archers. warriors get some experiance from the bonuses and from the few kills they will acumulate but not much

If you want to do some decent leveling early on, in Chapter 4, the stage Red Waterfall is great for it.

Wait 10 rounds and the catgirls are level 20. Wait 5 more rounds and they're level 30. Wait 4 after that and they're level 42. Wait two more and they're level 50. Two after that and they're level 60. Just pass 23 rounds before destroying the Geo Panel and you can be powerleveling stacks of characters in no time. I reincarnated my Heavy Knight into an Iron Knight and 3 battles later reincarnated him into a Steel Knight. Most of my people go from lvl 1 to 12 or 13 in the first battle alone. This level allows you to fight a decent number of creatures who can be any level you desire. . . twisted

I used cave of ordeal 1 and got my star skull from level 20 to 50 in one casting of Giga star (range of two, so two enemies being killed)

and item world ^^

Yeah, but not until you are strong enough to clear CoO4. I'm still in my first playthrough having just recently gotten the game. I'm going to use CoO1 until i have a team that can take on the other Ordeals

A good place for healers to level up is in the Dark World - Town Fields - Dead Tree Field. It may be considered lvl 10 difficulty, but all you have to do is cast a strong healing spell on the mages/skulls, and no matter how resistant they are to magic, they'll be damaged by the healing spell. I got my mage from lvl 50, all the way to lvl 225 by making them stronger every now and then.

Other good healers are Archers and Heavy Knights when they're taught how to be healers^^

*Despite my Mage being uber high level at an early part of the game, she still can't take on CoO4 by herself><

cave of ordiel 1

You can purchase them from the Black Merchant in the item world's Special stages. (green portals)

I'd recommend you just powerlevel on Red Waterfall and accumulate felonies until you can pass it by force/felony persuasion.

Except. . . He wants to know how so he can unlock the CoO. He can't use CoO 3 until he passes the bill and gets to it. Thus I recommended Red Waterfall.