In Dekaron, players control a single character, and move around a three-dimensional world, completing quests and defeating fiends (which may either be monsters, known in Dekaron as the Pitborn, or other players) to gain experience and become more powerful. In terms of player and player interaction, there is also a PVP option, and sometimes a PK (player killing) option outside safety zones.
[edit] Classes

When creating a character, players select one of seven classes. Each class offers various benefits and drawbacks, as well as access to different weapons, abilities, and skill trees. Unlike several other MMORPGs, there exist no races; the only character differentiation is through class. Once selected, character classes are permanent.

Azure Knight
The Azure Knight, a male class, are dependent on their choice of weapons; Knights can choose to use single-handed axes, single-handed maces, single-handed swords, shields, great maces, great axes, great swords, and shields; or they can choose two single-hand weapons to become a 'dual' knight.

Segnale
The Segnale, a vampire-like female class, have a range of effect spells, most of them curse based, including buffs to weaken enemies and party buffs. They function primarily as healers, yet they provide impressive combat skill when at a high level. They use Bloodwhips.

Incar Magician
The Incar Magician, a female class, focuses on 'traditional' offensive spells , with many of them having affinities to natural elements. They use Staffs and Wands.

Segita Hunter
Segita Hunters, a female class, are archer specialists, and are effective in both long-range combat and close-quarters combat. They use Crossbows, Bows (for long-range), and Daggers (for close-range).

Vicious Summoner
The Vicious Summoners, a male class, have the ability to summon creatures (Either Beast or Libido type) to aid them. Summoners use Twin Blades and Staffs, and serve well in mobbing since their summons auto-aggro monsters as well, resulting in twice the amount of monsters to kill.
* Bagi Warrior: The Bagi Warrior, a male class, functions as a tank character, and specializes in the use of self-buffs, various combos, and knockbacks. They use gauntlets.
* Aloken: The Aloken are female class that focuses on melee and magic combat as well as numerous buffs, and function as combo-based characters. They use spears and a "guardarm" shield.