Royal Heirs

Royal Heirs is a technology unique to the Ethiopians that can be researched at the Castle in the Castle Age in Age of Empires II: The African Kingdoms.

This technology provides a handy creation speed boost to the already rapidly-deployed Ethiopian unique unit, the Shotel Warriors.

Strategy
Royal Heirs is a sound choice for players who prefer to use their Shotel Warriors as emergency troops due to the Ethiopian unique unit already has a very fast deployment rate, though it can also provide a substantial tactical advantage to players who build their auxiliary Castles close to the enemy's base by letting them create massive amounts of infantry in a short time to overwhelm their opponent.

Theoretically, Royal Heirs could benefit players who frequently launch raids and worker line harassment attacks, though this is not advised in practice due to the late availability of the upgrade and the fact that even Elite Shotel Warriors struggle against almost every other unit type.

To players who prefer standard rank-and-file units, this technology is practically useless.