While looking at the information on monster enhancement in the 3.5 Monster Manual, it is no surprise that I ran across a few questions...They are as follows:
1) Would the save DC for a 24 HD gargantuan aboleth's slime & mucus cloud abilities be 29 (base 10+half of HD 12+constitution modifier 7 for a score of 24 in constitution)?
2) Would the following damages be correct for an aboleth's size based on table 4-3 on page 291: gargantuan=1d8 huge=1d6 large=1d4 medium=1d3 small=1d2? (& yes I am aware that the manual says that aboleth's don't hatch from their eggs until they are full grown adults, but just humor me. )
3) Would the following ability scores for strength, dexterity, and constitution be correct based on table 4-2 on page 291: gargantuan=str 34 dex 12 con 24 huge=str 26 dex 12 con 20 large=str 18 dex 14 con 16 medium=str 14 dex 16 con 14 small=str 10 dex 18 con 14? What about fluctuations in the abilities: intelligence, wisdom, and charisma?
4) How would one go about determining the HD of a creature smaller than described in the monster manual? An example being a medium-sized aboleth or a baby-youth of a certain creature?
3) How did you come up with those numbers for medium and small? I can't imagine that a smaller and typically younger member of a species would be as intelligent as an adult, but I suppose I could see how wisdom and charisma would stay the same...I guess I could tweak intelligence down a notch or two for a creature depending on how much younger it is than its adult version.
4) Hmm...Seems like there should be a set way to create a smaller version of a creature...I guess that is something I can work on myself.
3) Table 4-2 on 291. If you were to take a medium creature and turn him to a huge creature it would gain +16 str, -4 dex, +8 con. Small to huge would be +20 str, -6 dex, +10 Con. All I did was invert those bonuses. As for the mental abilities you should use whatever you think is appropriate maybe reduce them by 4 for a hatchling and 2 for a juvenile.
4) I have a feeling they didn't think people would want to weaken the critters, but that just means you can do whatever you want to them.