Thread:TsuchiNoKao/@comment-26544499-20200927173301/@comment-46261745-20201030160824

So, at the beginning of an enemy turn, 勢力キャラ行動初期化 sets any HP for annihilated troops back to 1 for all enemies.

シナリオ／勢力トップ heals their troop counts by 20% if their average troop counts are below 40% or by 10% if below 70%. I don't see anything specific to Motonari or about 個人 or Ｓ体力 in there though...

Oh, here it is, in 勢力トップ／毛利 ou have, specifically on Cursed Motonari:

Ｃ体力補充(999, 1035, 19);         Ｃ兵数補充(9999, 1035, 19);

This just seems to replenish his HP and troop count to full. Might want to look into those further?