Only Honest attribute points can be used. No points added by Followers or weapons qualify. Also, any points over 5 are lost in the transformation. For example, if the Fiendling has a 7 Strength and then earns 5 Craft, then it will lose 2 points when it changes. The change cannot be stopped, earning points bring about the change.

Special Abilities do not transfer to the newly evolved Character. Like a caterpillar, the Fiendling is a child, when it becomes a Pit Lord it is a completely different creature. What it could do at a previous stage is no longer possible.

After becoming a Fiendish it then must accumulate 10 Strength and Craft. Here's the "kicker" - the Fiendish CANNOT enter the Inner Region, whereas the Fiendling could if it felt able.

So once you begin evolving - KEEP GOING!