With the Dark Beam in hand, return to the Temple Assembly Site. Use the Dark Beam to open the previously locked door. This leads to the Temple Energy Core. Here, you'll need to activate three energy conduits to restore power. Each conduit requires a specific action, often involving shooting a target with the Dark Beam or using the Morph Ball. Once all three are activated, the central energy core will power up, unlocking new pathways and objectives.
After restoring power, a new path will open, leading you to the Sacred Path. This area introduces you to the concept of Dark Aether portals. You'll encounter your first portal here, which will transport you to the dark dimension. Be prepared for a significant shift in atmosphere and enemy types. The Sacred Path also contains several Missile Expansions and Energy Tanks, so keep your Scan Visor active.