Trickle down
From Anarchy Online Wiki [AOWiki]
Trickle down increases skills by 1/4 of the total of the abilities a skill is dependent on.
So a skill with 50% Strength and 50% Stamina dependency would be increased by 25 is both were 100
((100 * 0.5) + (100 * 0.5)) / 4 = 25
