First off, you may find Hard mode fairly difficult in the beginning, as even the weakest monsters take a chunk of your HP, or if your just wanting to level really fast to increase LUK, so you can complete drop lists, well, here is the trick for you. You need Sancutary, or Undead Killer (preferably undead killer, as its MUCH faster,) and I would recommend this for the second time through the game, so that you also have a shaman ring, two if this is the third time through. play normally through the game until the Sandy grave level. Go to the other end of the pyramid, where the sand worm, corpse weed, and Bagh Nak are, go one map to the left, and there should be five red skeletons lined up in a row, Kill them, one hit each, for , if one shaman ring, 156 exp, two shaman rings, 197. this is way better than exp netted from nest of evil, and much sooner in the game
you can get to level 50 in a bout 30 minutes. if only Old Axe Armor were this easy to kill... i killed 981 red skeletons to get to level 45 :[
another nice trick, is the same as the werewolf/back dash trick with killer clown, in Dawn of sorrow. try with each subweapon, but the boomerang, Yagyu shurikens, Darts, Bwaka knife( my personal favorite) work best. first, hold the up direction. always hold it down(make sure griffon wing is OFF) then, alternate the attack and back dash buttons as fast as you can, and look what happens. Everything dies. its uber spam of throwing weapons
...works even better if you have the magus ring ;P. GREAT for hard mode. something even better to do, preferably with slow monsters (i.e: most bosses, wont work on golems or guards, they deflect the weapon) equip charlotte with the time stop spell, (again ,magus ring= MUCH BETTER) then throw the Bwaka knife or boomerang ( boomerang is slower rate of damage, but a little heavier, i think bwaka knife adds up faster) and if the weapon is on an enemy, it will be constant damage as long as the time stop spell lasts. even cooler, is to use boomerangs, throw 6 of them in the spell, and watch them converge on your enemies
another neat trick for HARD mode, is i found zephyr really hard to beat , USE TIME STOP, all his weapons are pretty much useless
his knives stop, and he cant use his own time stop spell ^^ .
Abbadon- Use stone circle. works every time.
Double frankenstien room, or just frankenstien in general, I hate this boss, but hes much easier if you dont have to worry about the bullets and missiles. use a FULL Clear skies spell. he is disarmed quite well