The Plans for this dropped in Townlong Steppes while I was questing. I was around level 87 or 88 with 600 BS. I'm not sure of the exact mob, but I believe it was in Hatred's Vice. Anyway the listed stats and requirements for the recipe are correct.
Spell
Blessed Trillium Greaves
Physical
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Datamined from the current retail build. Numbers that scale with level or stats are shown at their base value.
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Community notes from Wowhead · 3 comments
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These plans can be learned from creating Balanced Trillium Ingot's as a blacksmith. You can create one Balanced Trillium Ingot per day unless you have Spirit's of War. With a spirit of war you can create as many Ingot's as you have Spirits.
Does anyone have a clue what this might be? Possibly 535-555 iLevel crafts that will drop in a future raid? If so, finally the Lightning Steel Ingot will be good for something other than 463-502 iLevel crap weapons.