Usually, when somebody says “step on me”, they don’t mean it literally. Unfortunately, Arturia Ruler is deaf to nuance, and just does it anyways (in her best ascension). Bright Ehangwen is something of a direct damage AOE NP, giving Arturia Ruler a threefold card booster buff before dishing out damage, then refunding her NP gauge like almost every single Arturia variant NP does.

The hitcount on this NP is barely enough to have some notable stargen to it, but what you really want to talk about is the damage - it’s not as impressive as you’re imagining.

With her 1-turn delayed Atk buff up, this NP does about 22k damage with no external modifiers. Without it, you’re looking at 18k damage. Amakusa comparatively in his current state does 21.5k dmg with his NP. Now that certainly isn’t awful damage - it’s enough to clear hands with a 50% gauge CE, something many can’t do, especially with class-neutral damage like Arturia’s.

But when you’re nearly tying a NP with a 3-turn damage steroid with your 1-turn delayed buff damage, you may end up having some issues. Bear in mind I have not even deigned to compare her damage output to someone like Quetz Ruler or Dantes, because honestly it might qualify as bullying.

Being able to double up on NP’s, however, is a more interesting discussion - Arturia Ruler is freely capable of messing with card draws to get a perfect NP brave chain, so if she can get a full gauge refund off it, she can compensate for her lower NP damage - right?

Sort of. Versus a Caster enemy for the 1.2x NP gain multiplier when attacking, Arturia Ruler can get 41% refund off a NPQA chain with all crits, no overkill, which is just enough to get back to 100% from her NP’s 20% gauge refund and her 1st skill. However, not only are the odds of getting her Arts card and a Quick in a hand pretty unlikely (my incredibly rough maths is putting it at about 20% odds? I’m sure somebody who knows probability better can give the exact number), but it only works on one class of enemy.

So my conclusion is - the damage is middling and no, doubling up on NP’s isn’t feasible without some external help.