The ogre lord was well named. It is the king of the monsters. Ogre lords range from levels 23 -25. They can give anywhere from 532 to 579 to 628 EXP! They are not easy to defeat, though. Even if their fist were not able to stun you, ogre lords have over 700 heart points! The second to last mission in the game asks you to defeat fifteen of them.
Ogre lord eggs hatch at level 12, making them as strong as a wild scorpion at birth. The eggs take 300 minutes to hatch (yes, it actually takes 5 hours for these creatures to come out of an egg).