In short, Forge of Legends is a classic, old-school RPG. That means different things to different people, perhaps. So to be more specific, it means the player will form a party of six characters, crafted by the player by combining races, classes, and other options. The player will then lead this party through dungeons, towns, and other places to battle monsters, solve quests, and earn rewards. Players of games like Wizardry and the original Bard's Tale will find this familiar.
As expected in a game like this, there will be "dungeon crawling," with plenty of combat. Combat will be turn-based, with a tactical approach that combines elements of grid-based and more traditional models such as used in other classic RPGs.