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'''Oath Seal''' – Like a [[Purity Seal]] it is a significant symbol for a [[Space Marines]]. It was take the form of wax grey or pale-yellow seal with parchment inscribed with some declarations. In contradiction to [[Purity Seal]], Oath Seal applied before a battle commending the [[Space Marine]] to victory. It is exactly known that by this Seal was marked on of the [[Emperor’s Children]] [[Contemptor Pattern Dreadnought]], that was identified as part of [[Eidolon]]’s Forces during [[Battle of Isstvan III|Isstvan Atrocity ]]{{Fn|1}}.