Dredge

**Incorporating Sonic and Light-Based Explosives**:

**DredgeCorp (DC)**:

*Open Use*:

1. **Salvage Operations**: Using these devices to clear underwater obstructions or collapsed passages in underwater buildings. The sonic explosives create shockwaves that dislodge debris, while the light-based explosives ensure precision without causing unnecessary damage to relics.

2. **Defense**: Around the perimeter of their base, DC might set up photonic-triggered munitions as a deterrent against intruders. The outward-facing side of their fortress, particularly their shipyard, would be dotted with decorative objects, which, when illuminated by specific light frequencies, would detonate.

*Covert Use*:

1. **Sabotage**: DC operatives might plant these explosives in strategic locations, like enemy supply routes or weapon caches, waiting for the opportune moment to trigger them.

2. **Traps**: In the treacherous underwater terrains, DC could set up sonic mines. When an unauthorized submersible or diver comes close, the mines emit a deadly sonic burst.

**Gardeners of Desolation (gOD)**:

*Open Use*:

1. **Terrain Modification**: The Gardeners would use the explosives to create new planting areas or to get rid of hazardous waste, transforming urban decay into thriving green spaces.

2. **Public Demonstrations**: To show their might or to deter aggression, they might have ceremonial detonations during significant events or festivals.

*Covert Use*:

1. **Assassinations**: Gardeners might use the photonic explosives hidden in bioluminescent plants. An enemy, lured by the glow, gets too close, and a directed light beam causes the plant to explode.

2. **Ambush**: They could strategically place sonic devices in dense foliage. When an intruder approaches, the sound vibrations disturb the local wildlife, causing a swarm of creatures to attack the threat.

**Sisters of Chorus (SoC)**:

*Open Use*:

1. **Celebrations & Rituals**: The Sisters might incorporate the light-based explosives in their ceremonies. As they sing their chants, coordinated light beams would trigger synchronized detonations, creating a visual spectacle representing the world's tumultuous history.

2. **Construction**: Using sonic explosives to clear land or reshape their spires, ensuring their infrastructure remains strong.

*Covert Use*:

1. **Knowledge Protection**: Any attempts to breach their archives or sacred places would be met with strategically placed sonic and light explosives. Intruders could be caught off guard by an explosion from what seemed to be a harmless artifact or tapestry.

2. **Espionage**: SoC agents might use the explosives as a distraction or escape mechanism. If caught or cornered, they'd use a small device, creating a burst of light or sound, allowing them to slip away.

Each faction, while having access to these technologies, utilizes them in ways that align with their core principles and objectives. The sonic and light-based explosives serve as tools, but also as symbols of the new world's volatile nature.