Hey all. I just finished this to get it off my plate. What do you think? Please lemme know, any feedback is welcome.

Way of the Raging Storm

Any input at all is appreciated 

I like it! I don't really have any suggestions for any changes to this... it seems nicely balanced and themed in a fun and interesting way.

Thank you. I wasn’t sure about balance and would like to know if people have ideas about that before I go back and code all the tooltips for V2.0

Any other feedback before I put it to bed?

 A suggestion - If you like the new UA monk variant rule that allows the monk to make a single unarmed strike as a bonus action after spending ki as a part of their action (in this case, casting Thunder Step, for example), you could implement that in your subclass to make sure that functionality is clear. Not sure whether you intended that UA feature to apply or not.

All in all, this seems really cool, well balanced, and flavorful.

Thanks Eddy. 

I had started this project before the UA. Would it still be balanced if they could do it after casting a level 5 Thunderwave?

 At 17th level? Yeah, that seems fine. It's not too different from a sorcerer quickening a 5th-level thunderwave and then hitting someone with a rapier as an action - and that could happen as early as level 9 for the sorcerer.

The going rate for Ki Points to Spells (as used by the Four Elements monk) is the Ki cost is (Spell Level + 1) (fireball is 4 ki points), with the one exception being a more niche spell, gust of wind, having a Ki cost of its spell level (2).

For your 17th level feature, I think you can go bigger if you want, with spells like Chain Lightning, Destructive Wave, and Freezing Sphere

And you can possible simplify the at higher level text to:

you can spend additional ki points to increase the level of a raging storm spell that you cast, provided that the spell has an enhanced effect at a higher level. The spell’s level increases by 1 for each additional ki point you spend, to a maximum of 1/4 your monk level.

Which should cover all spells they learn. And/Or maybe add a table:

3rd-4th: 1st
5-8th: 2nd
9-12th: 3rd
13-16th: 4th
15-20th: 5th

Quote from Houligan >>

The going rate for Ki Points to Spells (as used by the Four Elements monk) is the Ki cost is (Spell Level + 1) (fireball is 4 ki points), with the one exception being a more niche spell, gust of wind, having a Ki cost of its spell level (2).

For your 17th level feature, I think you can go bigger if you want, with spells like Chain Lightning, Destructive Wave, and Freezing Sphere

 Yeah, I considered the existing going rate for Ki costs. A friend of mine is playing a WotFE, and the Ki costs are a bit high. I was trying to actually make these spells a bit more accessible. Did I go too far?

I thought about those spells, but 6th level spells seemed a bit high. Am I overestimating how big a deal that is?

Quote from Houligan >>

And you can possible simplify the at higher level text to:

you can spend additional ki points to increase the level of a raging storm spell that you cast, provided that the spell has an enhanced effect at a higher level. The spell’s level increases by 1 for each additional ki point you spend, to a maximum of 1/4 your monk level.

Which should cover all spells they learn. And/Or maybe add a table:

3rd-4th: 1st
5-8th: 2nd
9-12th: 3rd
13-16th: 4th
15-20th: 5th

 I love this, thanks! I think I’ll use it. I just want to make sure it won’t apply to other spells they might learn from multiclassing.

Quote from EddyJ >>

 At 17th level? Yeah, that seems fine. It's not too different from a sorcerer quickening a 5th-level thunderwave and then hitting someone with a rapier as an action - and that could happen as early as level 9 for the sorcerer.

 It’s not the 17th level feature, it’s the 11th level feature.

You're right, that's my bad. Still seems fine. :)

Cool. Thank you!

I would probably go with Ki Cost = Spell Level then.

WotFE can get Wall of Stone and Cone of Cold at 17th level. So 5th level should be fine. I forgot Destructive Wave is PHB, not SRD though.

Sticking with 3rd levels should be fine, but at 17th+ level, it might feel underwhelming. I think you could balance giving them a higher level spell by limiting its casts, so they can only do their super spell once per short?/long? rest, rather than being able to just spam it 3x times per short rest.

Quote from Houligan >>

I would probably go with Ki Cost = Spell Level then.

WotFE can get Wall of Stone and Cone of Cold at 17th level. So 5th level should be fine. I forgot Destructive Wave is PHB, not SRD though.

Sticking with 3rd levels should be fine, but at 17th+ level, it might feel underwhelming. I think you could balance giving them a higher level spell by limiting its casts, so they can only do their super spell once per short?/long? rest, rather than being able to just spam it 3x times per short rest.

 So something closer to a Warlock's Mystic Arcanum?

Thanks!

PHB/SRD? You mean pay to see vs free to see?

Yeah, so you couldn't have Destructive Wave as a spell choice and keep it published homebrew.

Quote from Houligan >>

Yeah, so you couldn't have Destructive Wave as a spell choice and keep it published homebrew.

 Lightning Lure, Booming Blade, Witch Bolt, and Elemental Weapon are pay-to-see too?