Just a quick note:
The examples of Bonus from Energy Factor and Energy from the Median XL Wiki are outdated. They are based on a different formula that was implemented few years ago.
The formula you took from the docs does not fit to Examples.
Regarding Witchblood:
Just a clarification since I did not see any paragraph on this:
The Bonus from it does stack with Bonus from Energy Factor and Energy, not with the Spell Damage Value. This is what makes this skill so powerful in terms of Damage.
And in terms of itemization:
Steppe Sleeper
Steppe Sleeper
Boots (Sacred)
Defense: (1302 - 1627) to (1342 - 1677)
Required Level: 80
Item Level: 1
+1 to Barbarian Skill Levels
(10 to 40)% Movement Speed
+(100 to 150)% Enhanced Defense
30% to Strength
Requirements -100%
Socketed (4)
Tundra Walker
(Barbarian Windcarver Set)
and
Imperial Guard
Imperial Guard
Greaves (Sacred)
Defense: (1744 - 1984) to (1968 - 2239)
Required Level: 100
Required Strength: 650
Item Level: 118
+(1 to 2) to All Skills
(10 to 40)% Movement Speed
(51 to 100)% Bonus to Attack Rating
(6 to 15)% Life stolen per Hit
-10% to Enemy Cold Resistance
+(111 to 140)% Enhanced Defense
(6 to 10)% to Vitality
Socketed (4)
Guardian of the Sightless Eye
(Barbarian Oskill Set)
are both great options for midgame and in terms of missing stats and fhr and all res, a Blessed Honorific might do the job even better than
Megalith
Megalith
Boots
'LoFal'
Runeword Level: 73
+1 to All Skills
25% Cast Speed
15% Block Speed
+(115 to 143)% Enhanced Defense
+(10 to 20) to all Attributes
5% to Dexterity
Regenerate Mana +30%
Physical Resist 5%
.