Developing your guild base also develops your character. In exchange for special guild resources, you can train your character's special skills and upgrade their stats: defenses, resistances, maximum health, maximum mana, attack power, spell power and healing power.
To this end, the guild leader creates a special building. Apart from upgrading character stats, it also provides access to various other opportunities. For example, it enables you to explore skills that your character can use to move around the world.