[New technology idea] Area of conversion for monks

The idea is simple: An imperial technology in the monastery that allows a group of monks to convert enemies in a given area (like the size of a house, approximately, not too big). Each monk would select a different enemy in that area.

This impacts the game in two ways: - Monks would be still relevant for some civs in late game. - This gives room for the use of more formations (to avoid the area of the technology).

Besides, it should be a prized technology, like 500-700 gold.