https://www.icy-veins.com/d3/crusader-leveling-build-guide

https://www.icy-veins.com/d3/crusader-leveling-and-fresh-70-guide

Kanai's Cube choices are highly build- and content-specific, making them hard to summarize. Generally speaking, Crusaders should store the powers of the following items in the Cube as soon as they have the materials available:
The Furnace
In-geom, Messerschmidt's Reaver, The Mortal Drama, Fate of the Fell, Blade of Prophecy
X Faithful Memory
Akarat's Awakening, Frydehr's Wrath, Shield of Fury, Ivory Tower,
X Jekangbord
Guard of Johanna,
X Aquila Cuirass
Heart of Iron, Belt of the Trove, Khassett's Cord of Righteousness, Goldwrap, Sacred Harness, Hammer Jammers, Akkhan's Manacles, Bracer of Fury, Gabriel's Vambraces, Nemesis Bracers, Obsidian Ring of the Zodiac,
X Ring of Royal Grandeur
Unity, Convention of Elements and Avarice Band.