Trying to remember something for the Alchemist

[Gallant Armor]

I apologize in advance for the vagueness of this post.

I remember finding something for the Alchemist that would grant bonuses if they had discoveries like Vestigial Arm, Parasitic Twin, Greater and Grand Mutagen, etc.

For the life of me I can't find it. I honestly can't remember if it's a feat, item, archetype, discovery or something I made up in a dream. If anyone can point me to this elusive boon, I will be forever grateful.