[Creature] Horgita Jackalope

[Fax Celestis]

So crystal shards don't affect these at all? What about weapons called by the call weaponry power? Quarrels propelled by the launch bolt spell? What about attacks by summoned monsters?

All of those are objects (and one creature) that are completely mundane, except for the fact that they are created/summoned by a spell.

True, but those do not target or affect the jackalope directly, which means their immunity does not apply.