Ghosts do feel pain, as observed on a strike when helping Failsafe recover some of the ship.
Their electrical sensors may fry,
which does hurt.
However, an ant falling from a cliff and a person are two different levels of pain.
You could throw a ghost off the courtyard at the tower and I think it'd still be fine, relatively.
Its lightweight design and structured frame let it experience physical damage in a different way.
English
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[quote]You could throw a ghost off the courtyard at the tower[/quote] Me after it gets possesed in Shadowkeep: Beyond
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I wouldn't blame you in the slightest.