keystone vs minions?

Gain 0.0648% - 20% (based on Missing health) bonus Life Steal versus champions, and half as much versus minions. The amount of Life Steal gained caps-out at 80% missing health, but does not scale linearly. 10% missing health - ~1% 50% missing health - ~8% 80% missing health - 20%

which other works vs minions ?strength of ages ,thats it ?

why some ye some not.

fervor vs minions for half effect? deathfire ?