Legions of Legend

Legions of Legend are elite versions of regular Tomb Kings units (similar to Regiments of Renown) which are crafted or "awakened" using the Mortuary Cult, costing money, canopic jars and trade resources. Unlike Regiments of Renown, Legions of Legend are only available in campaign. Their unit icons in the UI have a blue-green semicircle, as opposed to purple for Regiments of Renown or orange for Blessed Spawnings.

The Legions of Legend tab allows players to increase their army cap by 1 at the cost of 10000 and 800.

Strategy
Most of the Legions of Legend are strictly better versions of their counterparts stat wise. The ethereal Legion is the only one that could be argued as they become vulnerable to magic. They can form a strong backbone to your army especially in the early game.