unlocking class abilities, Destiny 2, Guardian, skill tree, gameplay mechanics, subclass, experience points (XP), level up, missions, PvE, PvP, Crucible, Strikes, Raids, tutorial, in-game currency, upgrade, Light level, energy type, Solar, Arc, Void, Stasis, Aspects, Fragments, character progression, action RPG, first-person shooter, Bungie, gaming strategy, detailed guide, interactive environment, dynamic lighting, high-resolution textures, immersive sound effects.