Roc Companions larger than Large

[lowericon]

One of the PCs in my game is a ranger and just acquired a Roc animal companion (the giant birds).

Rocs are size Gargantuan, but when they're animal companions they get no larger than size Large. I'd like to find a way around that, to allow the PC to get a full-sized Roc.

I know the Mammoth Hunter prestige class lets certain land animal companions grow to size Huge, but it can't be applied to rocs.

I could just house-rule it to allow Mammoth Hunter to apply to rocs and adjust the powers, but that's dull and clunky. I'd prefer if there were another way. Something I don't have to house-rule.

Suggestions?

[deuxhero]

Assuming a roc is "megafauna", Goliath Druid lets you cast Enlarge Person on it.

edit: Rocs are still animals (your animal companion especially so as Animal Companion needs to be explicitly changed from animal to stop being one). Animal Growth works on them.

[lowericon]

deuxhero wrote:

Animal Growth works on them.

Just to clarify, I'm looking for a permanent change to the animal's size. Not a temporary spell.

[deuxhero]

Enlarge Person, applied by a Goliath Druid, can be made permanent for 2500 GP, though it suffers the normal limitations of permanency (doesn't restore itself if dispelled). Getting this on a Ranger's animal companion is a bit of a pain though.

[Chess Pwn]

there's no in game way to do it. SO you'll be houseruling whatever you do. mammoth rider is a good example, or you can do your own thing.