Royal Thief (Lv1 ~13.6M, variants Nell/Nightingale/Duke) appears at random during the Royal Thief event as an ambassador in front of your city wall (spawned by progressing Tavern activities). Tap the ambassador to make a Request; without a request, alliance members cannot attack. A request invites up to 5 alliance members (they get an email enabling their attack). Kill with CAVALRY only -- mixing ground/ranged/siege only increases wounding. Zero-wound counts: t10 280k or t11 150k. Drops resources (a recommended RSS boss) + 2,000 Spiritual Beast EXP. Tip: you can also chip it with a subordinate city of weak troops.
Original research source: Evony Guide Wiki
