I love koumei quite possible one of my favorite frames despite being below average but please tweak her what I'm about to say is the tip of the iceberg but if these changes were to be made I would be very happy
Remove the cooldown on Omamori, it has a locked 50% chance to work and then I've vulnerable for 3 seconds and cooldown pauses during shield gate that's foul like at-least remove that, imagine this happening with a wall latch challenge not very fun huh especially is a bullet hell, Revenant, Wukong, and Valkyr have on command invincibility why in Koumei Limited like this?
Remove the cooldown Bunraku it's far from a nuking tool it's not even a good damage power it has a slow cast in a 170° radius and while very soft it has los checks like ether ditch the los or make it a radius with like 16-20 meters of range
Remove wall latches from the challenge pool warframe is a fast pace game and this challenge goes against that and will get you killed in arguably what you should use koumei for (edurance) And through in the close contagon into the decree pool so I can at-least hope her 1 can actually do something without me rolling tripple 6's
Otherwise 4.4/10 frame 9.8/10 with all 45 decrees maxxed or somewhat close to it but 5 dice out of 7 slot machines in my heart thanks DE I love koumei but change her