How to get the Comet Azur spell in Elden Ring

pcgamer.com:

The Comet Azur spell stars in many Elden Ring clips on social media because it absolutely demolishes enemies and looks great doing it. It's a fairly late-game spell to get with a high intelligence and mind requirement, but if you have the FP bar to pull it off, it can nearly one-shot some bosses in the game, provided you beef up your magic damage too.

If you already plan to follow through with Sorceress Sellen's quest, you'll run into this spell naturally, but you can also grab it without ever talking to her in the early part of the game. To do that, you need to head to Mt. Gelmir and speak with a certain sorcerer. 

Here's how to get there, even if you haven't explored the northwestern part of Mt. Gelmir yet. 

Comet Azur sends out a massive blue beam of energy that deals huge amounts of damage, but the spell itself requires a whopping 60 intelligence. You can hold down R1 to continue the cast and drain your FP bar, so in a way, it also requires a fair amount of mind. You can combine it with the Cerulean Hidden Tear (for the Flask of Wondrous Physick) from the Minor Erdtree boss in Mt. Gelmir to give yourself unlimited FP for 10 seconds. If you're not running an intelligence-based build, this is the kind of spell worth making the effort to respec your stats for.