Вот намедни нашел в Вики еше два пропавших легиона:
Iron Hearts
Briefly mentioned in the short story "Hell in a Bottle" by Simon Jowett published in a Book entitled "Into the Maelstrom". Their Primarch is mentioned as "Primarch Rubineck", possibly one of the unknown primarchs listed in the space marine codex. The removal of this chapters name may be resultant of the content of the short story where at the end a chaos lord gains entrance to a training center via the body of a failed space marine. Further canon disregards the use of the name primarch and goes on to state that the Chapter was all but annihilated fighting the Chaos Lord who manifested in their system. Only two companies, the Sixth and Tenth, remain at full strength
Valedictors
Originally a First Founding Legion which saw action on the Eastern Fringe against Orks, Eldar, and traitors during the Horus Heresy. They were described in detail in two Epic articles in White Dwarf magazines 126 and 136, circa 1990-91. The status of the Valedictors changed in White Dwarf 235, where they are said to be of a "later founding," (post-Second Founding). Therefore, in the most recent canon literature, the Valedictors are no longer a First Founding Legion.
