Unity is a version of Honor. Tanavast is dead but his power and what was left of his Cognitive self merged with the Storm Father. Dalinar bonded with the Storm Father. After his connections and intent fully aligned with the intent of Honor he was able to ascend in a similar way to that of the Lord Ruler ascending at the Well of Ascension. The power is still not fully there but It allows Dalinar to use some of the Investiture of Honor.
Shardcast: Unity
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Unity is a version of Honor. Tanavast is dead but his power and what was left of his Cognitive self merged with the Storm Father. Dalinar bonded with the Storm Father. After his connections and intent fully aligned with the intent of Honor he was able to ascend in a similar way to that of the Lord Ruler ascending at the Well of Ascension. The power is still not fully there but It allows Dalinar to use some of the Investiture of Honor.