To earn extra experience, defeat monsters that are at a higher level than your own character. When multiple enemies at different levels are encountered, consider defeating the ones with the lower levels first; killing the one with higher levels may cause you to level up and earn less experience for the lower level kills. Because leveling up complete restores your health and mana, try doing so immediately before facing a Boss.
Races
Each race has various strengths and weaknesses, as well as unique stats. Humans and Dwarves are best suited for melee characters. Elves are recommended for glyph based characters. Halflings and Gnomes are good for classes that benefit from health and mana potions. Orcs are the best race for getting experience points. Playing a Goblin may present a challenge, as they are not suited at anything in particular.
Spell Glyphs
Some classes start with a specific spell glyph in their inventory. However all classes can use them after they are found in dungeons. Attacking enemies with spells is usually safer than melee attacks. However you may need to have mana potions if you use them frequently. Your maximum mana limit does not increase when leveling up. However, finding the three mana power-ups in each dungeon will increase it slightly.