The purpose of homing is to increase your total attribute, 20 homing+10 total attribute, and the highest homing 180 points (no matter how high).

There are two sources of acquired tropism:

The first is the additional attribute of equipment forging (in theory, it can reach more than 20 points, in fact, the highest score I have ever obtained is 17 points), followed by the additional orientation of rune stone. Rune stones are rarer and rarer, with a maximum of 60 points.

Then BB will have a tropism attribute when he grows up, which will be added to your tropism.