Like most RPGs, characters in Regnum Online grow stronger by gaining experience points (XP) and leveling up. As well as increasing the character's base stats, raising level will give discipline points and/or power points. It also unlocks new armor, weapons, rings and amulets for the character to equip.
Also, the moment a character levels up, he will regain all his health and mana. In very particular ocassions, a player very close to raise a level might kill a weak mob quickly in order to heal himself, surprising and possibly defeating his enemy.
XP can be gained in three ways: by killing creatures, killing other players and by completing quests. However for most levels, the amount of XP gained by quests will not be enough for the character to level up. Therefore they will have to kill creatures to gain the needed XP. This is known in RPGs as grinding, due to its somewhat tedious nature.
Regnum Online has a very interesting mechanic regarding group leveling. This includes everything from defined groups to just random teaming up in leveling areas. Just by participating 10% in the fight, either by damage, healing, buffing, debuffing and so on, a player counts as "helping" and the gained XP splits up. The advantage of this is that also both players get a group-bonus. This leads to players getting to know each other since teaming up is the fastest way of leveling. The maximum possible case is the Leveling Mob/Mass (Bola de Leveo in spanish). Players with numbers up to 10 just overrun an area and basically kill any creature at hand. The combination of areas, auras, healing, mana distribution, normal hits and power, create a destructive force that doesn't need to rest at all while killing everything in their way almost without stopping. Also, big groups can handle leader mobs easily and obtain rare loot faster, though currently killing leader mobs is not giving group bonuses nor split XP.
Once a character gains the required XP, they will level up. The discipline and power points awarded at each level can be found here. The XP required for each level is as follows:
|Level||XP Needed||Level||XP Needed||Level||XP Needed|
The maximum level is 60, and achieving this level is usually known as graduating. Players often like to invite their friends to their "graduation", and some make a very special event of it. However the game currently doesn't offer anything special for this: the level-up animation is the same as for all levels.