The spectres destroy what they inhabit. Everyone was aware of this now. The duration of 'occupation' may defer but it was the fate of the host to crumble and wither into nothingness. Antiques and monuments seemed to last longest. Having only been a decade it wasn't enough time to know how long that'd be the case.
When the inhabitation was finally reaching a final point the spectre grew far more powerful. Moulting from a chrysalis gave the best mental comparison. Jumping from host to host. Sometimes competing with their own kind.
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"Ahhh!" a shriek woke up his partners and broke him out of his reading session. A blurry figure materialised at the top of the slide. Acting as if it had been burnt. Moments later it became clear enough to say it was a lady. The ghost lady was not very tough; she was far from being a dangerous entity for them. No one showed any surprise at her reaction. The Rekha of salt would deter anything that wasn't occupying a host. Within reason of course... The 'more salt used','patterning' etc. would make it so much more effective against the entity attacking them. Some Rekhas also acted as a 'maze' or 'problem' that a spirit would need to solved before they could be attacked. Her wails were dread-inducing but also oddly comforting. As she spirited herself away they knew she'd either perish or find something to inhabit while she recovered.
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"Well, that's rude... She didn't even offer us a meal after our long trip." Oliver chided the no longer present spectre. He leaned down and check the circle. "Not damaged but we'll need to restock on salt soon. Our stock won't last us the trip back and we've already picked apart the places on our route."