Proposed Canon
Promotion to Heir Designate rarely occurs and is very expensive.Erf-b1-p079 It cost roughly 165,000 Schmuckers to name Prince Tramennis Heir Designate (5K for each of the 28 Archons=140K + 25K bonus for capturing one, assuming Gobwin Knob had not lost or gained any Archons in between the Battle for Gobwin Knob and the Battle of Expository Bridge.)
 Known Heir Designates
- Gobwin Knob
- Stanley - Former Heir Designate to King Saline IV; now Overlord. Stanley was popped as a non-heir Stabber, then promoted to Warlord, then promoted to Chief Warlord, then named Heir Designate, and upon the death of King Saline IV, became Overlord of Gobwin Knob. Stanley is the only known non-Noble Unit to be named Heir Designate, and the only known non-Royal Ruler of a formerly Royal side.
- Goodminton - Side destroyed
Since we have yet to see any unit named Heir Designate without already being a Warlord or Caster, it may be that only Warlords and Casters can be named Heir Designate.