I have been running around as an apex predator recently. However, it is not working as noted in the wiki.
-3 to intelligence, BUT learn combat skills faster and at no Focus cost. Tends to negate guilt penalties as well.Specifically I am still losing focus.
The actual description in game is vague as to the quantitative effect of the ability.
Your mind and brain have adapted to your new place in the world: as one on top the food chain. You can effortlessly master and maintain combat skills, but your critical thinking has atrophied further.Notably, the description is very different to the one on the wiki. I know the wiki is notoriously outdated.
Browsing the source, I have been unable to locate what effect, if any, apex predator has on focus drain to upgrade combat skills.