Well, the first Guide for Overlord ...
This game is so underrated :(

However, I hope this Guide helps you to gather all the objects. They are pretty usefull.

Enjoy the game!

• Castle Spree: You find this in the ruins of Castle Spree near the mana shrine, right behind a corner by the wall.
  
• Evernight Forest: At the Sacred Grove in the back of the Swamps area, It is right behind the sacred tree (you fight some bloody Unihorns first).
  
• Golden Hills: In front of the brewery on a ledge. You have to go through the brewery to get there.
  
• Heaven's Peak: Next to the enterence you found the Heaven's Peak. If you go left, you will find a Graveyard. In that Graveyard, guarded by some zombies, is the object.
  
• Ruborian Desert: Near the area with the Sand Worms, when you are chasing Jewel. If you follow the path away from where Jewel is going, you will run into some Black Sheeps and Raiders. Keep going till you find the objekt.
  
• Ruborian Dester: At the far end of the sand dunes. You have to kill all the Sand Worms first. Use the eggs to lure a Bomber Beetle onto the sand. You have to repeat this several times. Worms take 2 Hits, 4 Worms. If you are a badass, you can try a run ;)

• Evernight Forst: Where you get the Green minions.
  
• Heaven's Peak: Right across from the entrance to "The Moist Hollows", where you get the Blue Minions.
  
• Skull Den: First Crossroad left
  
• Golden Hills: Down the hill from where you teleported in. It is up a hill straight ahead from where you entered.
  
• Heaven's Peak: When you exit the Citadel, go right. You will find a hole in the wall. You will find a island with birds and the item.
  
• Ruborian Desert: At the first Sand Worm, you will see the this item. Distract the Worm and grab the item.

• First one is on the house, retrieve the Tower Heart and it is yours :)
  
• Mellow Hills: In the Halfling Village is a huge pumpkin. You are told to destroy it, do so, you will find this item in it.
  
• Evernight Forest: When you go after the third node, you will be attacked by minotaurs, there it is. You cant miss it.
  
• Mellow Hills: This on is pretty simple, you may have already noticed it. To the left of the spawn in the water, awaits this little gift. You need the Blue Minions go grab it. Well you have to go all the way around :)
  
• Golden Hills: Inside the temple construction side, near the Rock Giant.
  
• Heaven's Peak: It is in the basement of the "Halfway to Heaven"-Inn. When you meet the first Red Dawn Cultists, it is behind a door at the left.

Fire Spells

• Fireball: This one is for free. You get it. no matter what.
  
• Flamethrower: Heavens Peak, in the courtyard, where you emerge from the Understreets.
  
• Inferno: Arcanium Mine: When you switch off the fire, you are able to see it from a ledge. There is a Beetle filled path to it.

Shield Spells

• Shield: Evernight Forest: It is right beside Oberon's Tree.
  
• Shock Shield: Evernight Forest: You get this one after beating Oberon.
  
• Infernal Shield: Sanctuary: At the enterance to the Brewery, where you have to retrive the missing spokes.

Domination Spells

• Slow: Mellow HIlls: On the way to the Halfling Camp. It is inside a ruined tower close to the "Obey" Banners.
  
• Confusion: Golden Hills: Inside the Brewery, you really can't miss this one!
  
• Betrayal: Understreets: Right after you fight the serpent. The room is full of zombies, no chance you miss this ...

Minion Spells

• Anger: Evernight Forest: Right next to the second bloody unicorn.
  
• Berserk: Mother Goddess Temple: Right on top of the platform from the Jewel and Kahn cutscene.
  
• Legion of Terror: Golden Hills: In the Corner of the bar, outside the ruined village.

• Halflings Homes: It is the building you go search the food. It is near the entrance on a ledge to your right.
  
• Mellow Hills: In the spot where the party is, you will find a path to a burning field. You need the Red Minions to get this one.
  
• Evernight Woods: In the water off the path you take to the Viridian Caverns
  
• Heaven's Peak: In the Spawm, near where you exit the Moist Hollows. ♥♥♥♥♥♥♥ Birds ...
  
• Moist Hollows: Up on a ledge by one of the boulders you move to turn off the geysers in the path.
  
• Understreets: three bags of Gold await you, right behind the spot you fight the Serpent, on a ledge.
  
• Golden Hills: 4 Gold Carts, it is a quest, you cant miss it.
  
• Golden Hills: If you are entering the Stronghold from the teleporter outside, the bag is on a ledge to the left as you enter.
  
• Royal Halls: IMPORTANT, you have get these before fighting Goldo! It is on the left side before you fight Goldo!
  
• Arcanium Mine: In the Catwalk where you have to hit the levers to turn of the fires. It is down a path in the middle of the four vents.
  
• Heaven's Peak: When you are in the town, the way left from the citadel (where you find Velvet) you have to go left. You will find a small castle with people in front of it; there is a cutscene too. However, defeat the monks, and go left to the second, closed gate. On the right you will find a bag of gold. (If you dont manage to find this, nevermind, you will end up here, for killing Kahn ;)

There may be some more gold bags!

• Halflings Homes: Steal the food!
  
• Halfway to Heaven: You can steal the Succubus statue. It is in the room where you fight the Succubus.
  
• Velvet's Bed: Choose Velvet over Rose to get this.
  
• Brewery: Steal the Bear Kettle
  
• Royal Halls: Steal the Gold from Goldo, ♥♥♥♥ the elves ...
  
• Ruborian Desert: Steal the Goddess Statue from the Elves ...

• Mellow Hills: When you are entering the village coming from the portal, take the east (left) gate. Then go straight, you will pass a burning house. (Btw. it is the way to the Evernight Forest). However, you will find the Steel Smelter. You need the red minions to get it.
  
• Understreets: On the way inside the Heaven's Peak town, going through the sewers. The Durium Smelter is at the end of that level. You will have to exit the sewers first (because you need reds, but you cant spawn reds in this particular spot). However you will exit the sewers and get this one as objective (everyone talking about it). Open the gate, leave the town and go for the portal outside uphill. Grab some reds and go back inside the sewers, inside go left, to the burning baricade. Go get the smelter, you cant miss it.
  
• Arcadium Mine: You will get this one really late in game. You will need to rescue Velvet first to get acces to the brewery, finish the brewery and exit on the other side. There will be a portal and a castle with 2 Elves in Front of it. You need to take the path leading away from the castle, then turn right and find the Arcadium Mine. Enter it and fight your way to the end ;)

There are only 2 Maidens:

• Rose
  
• Velvet

You will run into Rose during the story, no worrys you cant her.
Velvet can be rescued later in the game. In the Heavens Peak City (the Castle). There is a really HUGH building at the citys farest end (messured from the main gate (the one at the teleporter). You need to go upstairs to enter it. Fight your way through it and fight the "Boss" ... well he was pretty lame ;D

After Velvet is found, you have to choose ONE mistress.

Oh and be advised, as soon, as you send the required number of minions to Velvet, you choose her instantly! (no "dragging, spinning or whatsoever)! So if you want Rose, dont play with Velvets bed ;)