Astral Mark of Ramuh FFXV (NGtE)

You passed the trial and now bear the Astral Mark of the Fulgurian Ramuh.

• You can summon Ramuh to intervene in a time of need. On the 4th or any subsequent rounds of a combat encounter or if the DM decides the summon is available to you, as an Action you can roll a d100, on an odd number, Ramuh appears, an ethereal presence of an Astral entity. A violent thunderstorm forms over the next two rounds and you can cast the chain lightning spell at 9th level, using your Spell Save DC.
• If any Astral entity intervenes, you can’t use another Astral Mark feature again for 7 days. Otherwise, you can attempt to use it again after you finish a long rest.