In which series of games do you collect souls to empower you and buy weaponry and armor with?

The series of games where you collect souls to empower yourself and purchase weaponry and armor is the "Dark Souls" series. In these games, players navigate through beautifully designed, interconnected worlds filled with powerful enemies and challenging boss battles, and the currency used for progress and upgrades is Souls. These Souls are obtained by defeating enemies or finding them scattered across the vast landscapes, and they can be consumed to level up the character's attributes or exchanged for weapons, armor, and other essential items from various merchants throughout the game. The unique gameplay mechanic of accumulating Souls creates a sense of risk and reward, as losing them upon death adds an element of tension and strategic decision-making to the overall experience.