world 1:
1 - fight miralda (left of start), she'll drop binder's set, which is amazing gear for 50% burden female builds. also go to dragon's nest (middle of the level, fastest to go right of the big spear if you're done with the level) to get purple flame shield (the best shield in the game, IMO).
2 - none
3 - none
4 - none
world 2:
1 - none
2 - halfway down the right-hand pit will be a dude that'll give pure greystone (good for str builds) if you show him the Bone Smasher (see below)
3 - Bone Smasher is to your first left, but make sure your item burden isn't maxed out, it weighs 20 (I missed it on my first playthrough because my item burden was too high when I removed it from the ground). great weapon for str builds, especially low level str builds. really fun weapon to use PvP because it looks so badass, and the rolling-R1 is an area of effect attack.
world 3:
1 - "help me!" screaming guy can be rescued if you have the key from 3-2. also, on the same jail level as him are some items, paring dagger & rogue set, but they're not great.
2 - key to "help me!" guy is around the first chain spot (keep going forward & left at every opportunity, then up the spiral staircase).
3 - none
world 4:
1 - satsuki'll be at the beginning, can't miss him, kill him for hiltless. if you just block and stay on him, he'll kill himself from hiltless damage, just strike if he tries to eat grass and it's the easiest fight.
2 - drop down the hole beneath the first reaper for makoto -- makoto coupled with either adjucator or ring of regen is solid enough to beat the game with even unupgraded, very good PvM katana.
3 - none
world 5:
1 - istarelle (a short spear) is up a ladder to the left of the first giant goblin -- this spear is sorta hard to get depending on your build, as you'll have to fight 3 giant goblins at once in a small area. use thieves ring and try to pick them off one by one. great weapon for PvM faith builds.
2 - talk to selen, in the second main swamp area, to the right of where you first enter it. she'll give a ring after you've done 5-3's PWWT event and if you kill her (do it) you'll get beggar's set, which is weak but looks cool (female only).
3 - kill black phantom garl here to do the 5-2 event