[Slydria]

a percentage damage buff is way overcompensating on warmonger's drums, with a little more swa it'd be fine as a leftover M spender/way to prepare without approaching enemies even without its charge mind aspect - especially if it was less strict about how long that buff lasted.

I think it's fair to be concerned over the nature of percentage damage increases, however, that's basically what Charge Mind is, a % damage increase but for a specific handful of spells. This mostly takes that idea, lowers that damage and makes it more broadly applicable and less punishing if you don't roll the LUC effect.

I avoided making the SWA effect better because of the changes I'd like for Samba and I don't think it would be terribly creative to have two SWA boosting songs.

That said, I'm not that attached to the first idea for the Song, more the understanding that Warmonger's Drums currently is not healthy for the game in either direction and needs change.

aria already gets a decent amount of evade from amplified aria so increasing the cel buff instead would help it avoid hitting evade buff caps, right?

I think you're right in that between this iteration of Aria, Amplified Aria and Dodging Tomatoes, a Performer could be just shy of the Evade cap and adding some other class passive would easily reach it.

That said, your own character isn't the only benefactor, Amplified Aria will fall off much faster than the base effect and the base effect should be able to stand alone so you make it a consideration for Dancers and more importantly future Bard promotions.

You certainly could increase the SKI/CEL or even make the SKI/CEL boost apply as a 'Base' increase but I personally think it's also good for it to be beholden to the Hit/Evade cap since it is an AoE.

5% on all elements is honestly pretty decent on dawr if you have the stats to keep the buff going through second verse, so maybe just tack on the crit evade. sayakana got nerfed for a reason.

It was but I'm pretty sure that reason was due to how it was the main reason omni-elemental resist strategies were so oppressive. What I want from Dawr is for it to be more impactful as a defensive buff and I think Damage Reduction is a fine alternative if 10% omni-resist would just cause problems again.