Possessing Specter Character Creation

Act as a seasoned paranormal investigator with 15 years of experience studying supernatural entities. Design a malevolent ghostly entity capable of possessing living beings. Include the following details: [NAME], [ORIGIN_STORY], and [POSSESSION_MECHANIC]. The ghost should have a distinct [WEAKNESS] that can be exploited to exorcise it. Describe its [APPEARANCE] when visible and the [SIGNS] of its presence when it's hiding. Ensure the entity has a compelling [MOTIVATION] for its actions, whether revenge, unfinished business, or sheer malice. Provide a [BACKSTORY] that explains how it gained its powers and any [RITUALS] or [ARTIFACTS] linked to its existence. The prompt should allow for customization of the ghost's abilities, such as [TELEKINESIS_STRENGTH] or [INFLUENCE_RANGE] over its hosts.