Cleon
Legend
Okay, let's continue!
Okay, let's consider the ability scores.
Strength
Elephants are STR 22 and Mammoths are STR 24, while Vrock are STR 17.
The Fiend Factory Gurgotch only does 1d10 damage with a tusk, while a 1E/2E Elephant does 2d8 (!) and a Mammoth does 3d6 (!!) which argues that that they're either weaker or their tusks are less effective weapons.
That doesn't seem right for a Demon Elephant the same size as an actual large elephant, so I'd lean towards giving it the same Strength as an Elephant/Mammoth or averaging the two to STR 23.
Dexterity
Hmm, it's got a lot higher Armour Class than an elephant, so maybe some of that is because its way more agile than a non-demonic Pachyderm? If it had a +2 Dex bonus like a 5E Vrock instead of –1 like an Elephant, that'd account for its AC being three points higher (15 rather than 12).
So maybe DEX 14? Or DEX 12 or 13 plus skin that's a bit thicker or tougher than an Elephant? That'd be a pleasant surprise for adventurers fighting it!
Constitution
We've decided on CON 19 already.
Intelligence
The current INT 10 is fine by me.
Wisdom
The current WIS 12 is fine by me.
Charisma
Giving it CHA 12 feels a tad high. An ordinary Elephant has CHA 6 and a Vrock has CHA 8. Somewhere from 7 to 9 would suit me better.
STR DEX CON INT WIS CHA ## (+–#) ## (+–#) 19 (+4) ## (+–#) ## (+–#) ## (+–#)
Okay, let's consider the ability scores.
Strength
Elephants are STR 22 and Mammoths are STR 24, while Vrock are STR 17.
The Fiend Factory Gurgotch only does 1d10 damage with a tusk, while a 1E/2E Elephant does 2d8 (!) and a Mammoth does 3d6 (!!) which argues that that they're either weaker or their tusks are less effective weapons.
That doesn't seem right for a Demon Elephant the same size as an actual large elephant, so I'd lean towards giving it the same Strength as an Elephant/Mammoth or averaging the two to STR 23.
Dexterity
Hmm, it's got a lot higher Armour Class than an elephant, so maybe some of that is because its way more agile than a non-demonic Pachyderm? If it had a +2 Dex bonus like a 5E Vrock instead of –1 like an Elephant, that'd account for its AC being three points higher (15 rather than 12).
So maybe DEX 14? Or DEX 12 or 13 plus skin that's a bit thicker or tougher than an Elephant? That'd be a pleasant surprise for adventurers fighting it!
Constitution
We've decided on CON 19 already.
Intelligence
The current INT 10 is fine by me.
Wisdom
The current WIS 12 is fine by me.
Charisma
Giving it CHA 12 feels a tad high. An ordinary Elephant has CHA 6 and a Vrock has CHA 8. Somewhere from 7 to 9 would suit me better.