There are several sources of EXP for leveling up your heroes. 1. * World Conquest Completing a dungeon/stage rewards you with some EXP. Each and every one of participating heroes will get the amount listed in Basic Clearing Rewards. It does not matter whether the hero died in the stage, or finishes more enemy units. 1. * EXP Synthesis Additional EXP can be gained by using the EXP Synthesis panel in hero details.