doing some experiments on Death shield... is the passive necessary?

i tried to increase the "DEATH MASTERY" from 50 to 75... to see if the DEATH SHIELD become better.. but seems that nothing changes.. anyone experiencing this?

Death Mastery

Death Mastery
Lastseen: R28

Skill: Death Magic Innate Skill
Type: Innate
Prerequisite Skills: Death Attunement (Level 10)
Learned From: Skills Trainer
Life drains give more hit points.
Effect
+0.1% Death Effectiveness
(increases as skill raises)

Death Shield

Death Shield
Lastseen: R28

Skill: Death Magic Glyph
Type: Active
Focus Cost: 4
Prerequisite Skills: Death Ray (Level 10)
Reagents: Garlic x 1; Mandrake Root x 1; Serpent Scales x 1
Learned From: Skills Trainer
Converts a portion of damage received from physical attacks to health.
Effect
Cooldown: 6 seconds
20% Chance to consume reagents
+10.2% Death Transfer Percentage for 10.2 seconds
(effect increases with skill)


maybe is right that the death shield can't be improved using the passive?

 

the innate affects life drains. i'd expect that to be death touch and death ray, but death shield isn't actually draining hp from an enemy.

 

ok another skill that i don't need to train...