Khan's Guard: If a unit with this special rule is joined by a character with the Quell Treachery special rule, they become Stubborn as long as the character remains in the unit.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Khan's Guard: If a unit with this special rule is joined by a character with the Quell Treachery special rule, they become Stubborn as long as the character remains in the unit.