I've soloed all 8 of my charis leg seals off of Manohra in abyssea miseraux. I wouldn't call it easy, but it's definitely doable for anyone with the right gear, no abyssea shell, and no desire to run around doing ridiculously long quests that never give DNC seals.
Manohra is popped by trading an avian remex to the ??? in teh frigatebird area, they can usually be bought off the AH for a very low price or you can farm them when there aren't 17 alliances competing for them. Manohra is very accurate and very evasive. I had to wear all the evasion gear that I have to keep my shadows up, and macro in my haste for utsusemi.
My evasion skill is capped, but not merited, and my evasion gear looks something like this:
Might seem like overkill, but it seemed to be barely enough to survive to me.
Here's how the fight goes.
Make sure the area around the ??? and the path along the wall toward the cave with the conflux is clear then trade the item and run toward the conflux where alliances usually fight birds. I used pizza for food because he seems pretty evasive and my hits didn't do much to him. Basically just whittle away at him with WSs when you can manage, and melee hits + Climactic Flourish when you can't. He seems pretty resistant to SC dmg so wild flourish is usually a waste of FMs, but Building flourish does great. Try to keep at least two shadows and fan dance up at all times. He can double attack, and use some pretty damaging TP moves. Helldive can take off around 800 dmg without fan dance up and he'll often use it right after a double attack. Damnation dive is hard to predict, and witout fan dance up it can alo do massive dmg. It can take 1 2 or 3 shadows, it's never the same. If it strips you of shadows and still does dmg you, or hits you with no shadows up, you will be stunned for 30+seconds and be afflicted with unremovable silence that lasts about a minute. If it strips you of shadows and does no dmg then you wont get stunned or the silence effect at all. Damnation dive can be stunned with Violent Flourish if you're fast. What I did was melee, BF/WS, use Climactic Flourish whenever I could spare teh FMs or when No Foot Rise was up, kept fan dance and shadows up at all times, and enjoyed the ride. Violent Flourish seems to stun often, and gives you just long enough to recast ichi when Ni isn't up yet. If you get hit with damnation dive, Basically hope you have Fan Dance up, a way to get a lot of TP fast for cures, and enough evasion that you wont get hit too many times while you're silenced.
It's not an easy fight, but it seems to have a MUCH better drop rate on Charis seals than that stupid quest. I got all 8 of my seals in 12 kills. The fight is made MUCH easier if you've got good atma to back you up.