@ DrMorrison
If nothing has been changed-- from the original OSI/EA code, by staff-- then your answer is: yes.
While under the effects of Vampiric Embrace, you will always gain 20% life return from all attacks preformed. [Note: 20% of 50 damage = 10hp]
When using weaponry with the Life Leeching ability the formula is something like this: (Weapon Damage * Life Leech Intensity * 30% or [0.3])
Example:
[Damage = 50]
[Life Leeching % on weapon = 50]
Vampiric Embrace: 50 damage * 20% (or 0.2) = [10hp] returned.
Life Leeching Weapon: 50 damage * 40% (or 0.4) * 30% (or 0.3) = [6hp] returned.
Total Life returned = [16hp] a swing---until something in the mechanics changes... like weapon damage increase/decrease or the removal of the Vampiric Embrace spell.
I hope this helps you out DR. and everyone else wondering how things work in this field.
(All information gathered from UOGuide, and Life Leech/Vampiric Embrace help related articles on the Inter-webs)
--Sturger, of Skara Brea; reporter at Large, EVO-Herald--