BOZ
Creature Cataloguer
Research complete! 
i decided to compare by the most obvious physical statistics, so let's see...
Name / HP / AC / MR%
Demons:
Demogorgon / 200 / -8 / 95
Juiblex / 88 / -7 / 65
Orcus / 120 -6 /85
Yeenoghu / 100 / -5 / 80
Baphomet / 106 / -4 / 75
Fraz-urb'luu / 233 / -2 / 70
Graz'zt / 186 / -9 / 70
Kostchtchie / 96 / -3 / 60
Pazuzu / 155 / -9 / 90
Devils:
Asmodeus / 199 / -7 / 90
Baalzebul / 166 / -5 / 85
Dispater / 144 / -2 / 80
Geryon / 133 / -3 / 75
Amon / 126 / -2 / 70
Bael / 106 / -3 / 70
Belial / 154 / -4 / 80
Glasya / 69 (cute) / -2 / 60
Hutijin / 111 / -4 / 65
Mammon / 139 / -3 / 75
Mephistopheles / 188 / -6 / 85
Moloch / 126 / -3 / 70
Titivilus / 86 / -2 / 75
Elementals:
Cryonax / 90 / -6 / 75
Imix / 90 / -4 / 85
Ogremoch / 110 / -7 / 85
Olhydra / 90 / -5 / 75
Yan-c-Bin / 85 / -6 / 90
Slaad:
Ssendam / 197 / -6 / 85
Ygorl / 210 / -7 / 85
OK, we can compare this to ToH stats. (I skipped some lords, since after all, we weren’t planning on going quite with ToH stats).
Name / HD / +nat armor / SR
Demons:
Baphomet / 30 / 36 / 35
Fraz-urb’luu / 46 / 36 / 41
Juiblex / 33 / 35 / 38
Kostchtchie / 28 / 36 / 36
Orcus / 45 / 40 / 46
Pazuzu / 34 / 40 / 41
Devil:
Amon / 22 / 32 / 34
Bael / 19 / 26 / 31
Geryon / 35 / 40 / 39
Hutijin / 20 / 27 / 32
Moloch / 33 / 32 / 29
Titivilus / 15 / 26 / 30
Slaad:
Ygorl / 48 / 37 / 42
Ssendam / 40 / 36 / 40
And then to the main event, the lords from BoVD.
Name / HD / +insight-+nat armor / SR
Demons:
Demogorgon / 39 / 9-18 / 42
Graz’zt / 36 / 6-13 / 38
Juiblex / 26 / 10-15 / 30
Orcus / 37 / 6-20 / 41
Yeenoghu / 33 / 6-18 / 32
Base 3.5 Balor / 20 / 0-19 / 28
Devil:
Bel / 26 / 15-20 / 30
Dispater / 34 / 0-25 / 38
Mammon / 34 / 11-22 / 37
Belial/Fierna / 36 / 6-17 / 36
Levistus / 33 / 7-15 / 37
Hag Countess / 33 / 6-18 / 35
Baalzebul / 38 / 12-25 / 41
Mephistopheles / 38 / 9-20 / 43
Asmodeus / 35 / 9-25 / 45
Base 3.5 Pit Fiend / 18 / 0-23 / 32
Note that all the lords from BoVD have abilities common to their type. All have (or should have) darkvision 60 ft, telepathy, summoning, and their race’s various immunities and resistances (which may be bumped up of course). DR has changed a bit since the printing of BoVD, so most fiend lords would now have something like DR 15 or 20/epic and good. In addition to these powers, most of the lords have a healing power (fast healing for demons, regeneration for devils), and most demon lords have see invisibility.
The conclusion I came up with is that, while it’s far from exact, the crossover is close enough that we can invent some kind of pattern going from 1E to 3.5 (2E is another matter, which we will get to sooner or later). What I think we should work on first is the big one: Hit Dice. It may be something to the effect of “if you had 141-150 hp in 1E, you have 34 HD in 3.5, and if you have 151-160 hp in 1E you have 35 HD in 3.5…” Note: we naturally want the weakest lord to be more powerful than the weakest of the most powerful kind, this is why I included balors and pit fiends on the list! We can use adjustments as appropriate, such as +1 HD if it's a demon, or whatever makes sense.
Get the idea? Then, once we have HD figured out, the rest should flow pretty naturally. When we have a set of conversion guidelines that work for fiend lords, it technically should work for converting other epic-level beings.

i decided to compare by the most obvious physical statistics, so let's see...
Name / HP / AC / MR%
Demons:
Demogorgon / 200 / -8 / 95
Juiblex / 88 / -7 / 65
Orcus / 120 -6 /85
Yeenoghu / 100 / -5 / 80
Baphomet / 106 / -4 / 75
Fraz-urb'luu / 233 / -2 / 70
Graz'zt / 186 / -9 / 70
Kostchtchie / 96 / -3 / 60
Pazuzu / 155 / -9 / 90
Devils:
Asmodeus / 199 / -7 / 90
Baalzebul / 166 / -5 / 85
Dispater / 144 / -2 / 80
Geryon / 133 / -3 / 75
Amon / 126 / -2 / 70
Bael / 106 / -3 / 70
Belial / 154 / -4 / 80
Glasya / 69 (cute) / -2 / 60
Hutijin / 111 / -4 / 65
Mammon / 139 / -3 / 75
Mephistopheles / 188 / -6 / 85
Moloch / 126 / -3 / 70
Titivilus / 86 / -2 / 75
Elementals:
Cryonax / 90 / -6 / 75
Imix / 90 / -4 / 85
Ogremoch / 110 / -7 / 85
Olhydra / 90 / -5 / 75
Yan-c-Bin / 85 / -6 / 90
Slaad:
Ssendam / 197 / -6 / 85
Ygorl / 210 / -7 / 85
OK, we can compare this to ToH stats. (I skipped some lords, since after all, we weren’t planning on going quite with ToH stats).
Name / HD / +nat armor / SR
Demons:
Baphomet / 30 / 36 / 35
Fraz-urb’luu / 46 / 36 / 41
Juiblex / 33 / 35 / 38
Kostchtchie / 28 / 36 / 36
Orcus / 45 / 40 / 46
Pazuzu / 34 / 40 / 41
Devil:
Amon / 22 / 32 / 34
Bael / 19 / 26 / 31
Geryon / 35 / 40 / 39
Hutijin / 20 / 27 / 32
Moloch / 33 / 32 / 29
Titivilus / 15 / 26 / 30
Slaad:
Ygorl / 48 / 37 / 42
Ssendam / 40 / 36 / 40
And then to the main event, the lords from BoVD.
Name / HD / +insight-+nat armor / SR
Demons:
Demogorgon / 39 / 9-18 / 42
Graz’zt / 36 / 6-13 / 38
Juiblex / 26 / 10-15 / 30
Orcus / 37 / 6-20 / 41
Yeenoghu / 33 / 6-18 / 32
Base 3.5 Balor / 20 / 0-19 / 28
Devil:
Bel / 26 / 15-20 / 30
Dispater / 34 / 0-25 / 38
Mammon / 34 / 11-22 / 37
Belial/Fierna / 36 / 6-17 / 36
Levistus / 33 / 7-15 / 37
Hag Countess / 33 / 6-18 / 35
Baalzebul / 38 / 12-25 / 41
Mephistopheles / 38 / 9-20 / 43
Asmodeus / 35 / 9-25 / 45
Base 3.5 Pit Fiend / 18 / 0-23 / 32
Note that all the lords from BoVD have abilities common to their type. All have (or should have) darkvision 60 ft, telepathy, summoning, and their race’s various immunities and resistances (which may be bumped up of course). DR has changed a bit since the printing of BoVD, so most fiend lords would now have something like DR 15 or 20/epic and good. In addition to these powers, most of the lords have a healing power (fast healing for demons, regeneration for devils), and most demon lords have see invisibility.
The conclusion I came up with is that, while it’s far from exact, the crossover is close enough that we can invent some kind of pattern going from 1E to 3.5 (2E is another matter, which we will get to sooner or later). What I think we should work on first is the big one: Hit Dice. It may be something to the effect of “if you had 141-150 hp in 1E, you have 34 HD in 3.5, and if you have 151-160 hp in 1E you have 35 HD in 3.5…” Note: we naturally want the weakest lord to be more powerful than the weakest of the most powerful kind, this is why I included balors and pit fiends on the list! We can use adjustments as appropriate, such as +1 HD if it's a demon, or whatever makes sense.
Get the idea? Then, once we have HD figured out, the rest should flow pretty naturally. When we have a set of conversion guidelines that work for fiend lords, it technically should work for converting other epic-level beings.
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