I base this type of hallucinations in the Bliss hallucinations of Far Cry 5 but giving it my touch.
Although all the symbionts can emit spore, the symbiont type 2 spores are special. These spores make that the payer feels like it is floating in a cloud. It can go from sensory experience until a complete hallucination of a paradise. Going by light angels and celestial voices. If the players pass too much time exposed to these spores could have some secondary effects like see everyone smiling like idiots without a brain.
My idea with this last type of hallucination is that it will change how much more time the players pass exposed to it. Distorting reality.