Phoenix = normal map boss B15, Power 262.7M. Zero-wound: t14 cavalry 2.27M at +1,526% mounted attack (buff breakdown ~ Mounted Atk 1,393% + Against-Monster Mounted Atk 103% + In-rally Atk 30%). Effectively the top of the solo one-round band; Jormungandr B16+ always take wounds. Doctrine (all normal/most event bosses): fight with only the single highest tier of MOUNTED cavalry, one wave, to one-round-kill for zero wounds; buff mounted attack first, count second. Skill books: Mounted Attack Against-Monster Lv4, Mounted Attack Lv4, March Size Lv4. Add an AGAINST-MONSTER debuff (not a normal debuff), e.g. Dragon Equipment Set (4); monster Def debuff caps at -50% (5x set). In a rally only ONE joiner needs the against-monster debuff -- it does not stack across joiners. Monarch Talent Lv6 'Mortality' halves wounds. Rally-join = 1 general + 1 mounted troop (loot-agnostic).
Original research source: Evony Guide Wiki