Increasing Size as Class Ability

[RUMBLETiGER]

Druids can do this as one of many, many class abilities, and can grow from Tiny to Huge without feats or PrCs that grant more.

With this in mind for perspective, I thgink your designing the class ability to be rather underpowered.

I don't want to mess with the vision you have for your theme, so ignore what I'm about to say if it doesn't fit, but here I go:

I'd suggest if you're wanting a PrC focused on size increases, consider:

-Extending your attack reach, like from Warshaper.
-Increasing your size catagory by 1 permenently, as you said, but also grant a # of times per day where you can grow an extra size catagory at some duration.
-Boosts to STR and CON in addition to what you get for the size catagory growth, also similar to Warshaper.

Also, if you're based around cannibalism, I vaguely recall a feat or template for undead that eat dead flesh and heal HP. If I rememeber what it is I'll post it, but consider something along this mechanic if it would serve you. Make drinking blood or eating flesh have the effect of a potion, for example.

 

[Samloyal23]

More tweaking. These are based on the Vile Deformity feats, if you're familiar with those. Do the numbers look high or low? Hmm...

Monstrous Frame I: Your vile diet of human flesh makes you start to grow, your natural reach increases by 5 ft. However, because of your unnaturally long limbs, you're much clumsier with your attacks than before, giving you -1 to all attack rolls. Your height is increased to your racial maximum.

Monstrous Frame II: You are growing used to your height but you are withering away from hunger no matter how much flesh you eat. Add +2 to Dexterity, Escape Artist, and Intimidate but -2 to Constitution. You know longer suffer a penalty on attack rolls.

Monstrous Frame III: You continue growing, reaching the next larger size and gain a further +1 Dexterity and +2 Strength in addition to the modifications gained from increasing in size as your gaunt frame is covered in dense cords of muscle.

 

[emanresu]

to OP I say give the racial feat POWERFUL BUILD at 5th level then at 10th this class can increase in size, similiar to a Lycanthrope, or just slowly grow as you have already noted

 

[Samloyal23]

to OP I say give the racial feat POWERFUL BUILD at 5th level then at 10th this class can increase in size, similiar to a Lycanthrope, or just slowly grow as you have already noted

Just found that feat, going to mull it over...

 

[Samloyal23]

Just found that feat, going to mull it over...

Mulled...

Monstrous Frame I
Your vile diet of human flesh makes you start to grow, your natural reach increases by 5 ft. However, because of your unnaturally long limbs, you're much clumsier with your attacks than before, giving you -1 to all attack rolls. Your height is increased to your racial maximum and you gain +1 Strength.

Monstrous Frame II
You are growing used to your height but you are withering away from hunger no matter how much flesh you eat. Add +2 to Dexterity, Escape Artist, and Intimidate but -2 to Constitution. You know longer suffer a penalty on attack rolls. Whenever you are subject to a size modifier or special size modifier for an opposed check (such as during grapple checks, bull rush attempts, and trip attempts), you are treated as one size larger if doing so is advantageous to you. You are also considered to be one size larger when determining whether a creature’s special attacks based on size (such as improved grab or swallow whole) can affect you. You can use weapons designed for a creature one size larger without penalty. However, your space remains that of a creature of your actual size.

Monstrous Frame III
You continue growing, reaching the next larger size and gain a further +2 Dexterity and +4 Strength bonuses, in addition to the modifications gained from increasing in size as your gaunt frame is covered in dense cords of muscle.