Soloing ODIN

People did VD at ML0, not sure what you're asking.

If the STR gains from ML make it impossible to do zero damage

At some STR level you hit for 1 damage

Removing your STR merits, removing dagger merits, might bring it back down, I don't know the break point.

Simply using slightly shittier gear will get you back down too

I started hitting for 1 damage mid Odin attempt at some point in the Mlvl 30 range when I got a dagger skill up after an EP session. I responded just by changing my gear around and got the damage back to 0. I haven't hit Mlvl 50 yet but I know I tried as high as Mlvl 43 with this set and still hit for 0:
ammo="Ginsen",
head="Malignance Chapeau",
body="Ayanmo Corazza +2",
hands="Malignance Gloves",
legs="Carmine Cuisses",
feet="Ayanmo Gambieras +2",
neck="Clotharius Torque",
waist="Orpheus Sash",
left_ear="Sherida Earring",
right_ear="Leth. Earring +2",
left_ring="Chirich Ring +1",
right_ring="Chirich Ring +1",
back={ name="Sucellos's Cape", augments={'DEX+20','Accuracy+20 Attack+20','Accuracy+10','"Dual Wield"+10','Phys. dmg. taken-10%',}},

I can try again tonight at Mlvl 47 to see if I still hit for 0 but I suspect that I will.

Edit: I should add that I mostly did this on D. On VD, Macc with my set would lead to not all enspell hits hitting for full damage so I would run the risk of timing out without killing it. On D it goes down in about 10-15 minutes IIRC.

After a few times on VD with mixed success, I abandoned VD unless I teamed up with another RDM which is certainly the way to go, IMO. It just makes the fight rather trivial and still fast. I am not sure if this would be hitting N for 1 damage. On my VD kills I usually saw double drops which makes it worth doing even with teaming up but I got most of my drops just soloing D.

I am now ML50 so I could test that I guess, but last time I did like 4-5 VD Odins for a Friend as a RDM ML 41-43 and I was hitting for 0 just fine.
Completely solo, just self buffs and geo trusts.

Weapons used were uhm... Norgish Dagger and the other one from Ambuscade. Not that it matters anyway.

Not sure if I used food, if I did it was Oden.

Another good job to team up is SMN. Enfire from Ifrit done by bis SMN is way stronger than enfire from bis RDM and 26%+ double attack is nice too.

How does that work? As near as I can figure, max enhancing skill is like 702, which translates to 90 damage enspells just based on the formula without factoring in gifts or merits. If the formulas on bgwiki are right, Inferno Howl would need to be cast with like 1000 summoning magic skill to match that. Is there some bonus summoner gets that the formula isn't showing?

For the record, I did a couple of D runs on rdm ML 50 earlier today and had no issue with damage whatsoever. I kept hitting 0 as expected.
No buffs, no attack+ on gear. I was at 718 attack.

Thanks for the reply!
I've been meaning to follow up.

That's good to hear. I feel better about working on grinding to ML50 now.