The Blood of Gargos is one of the 10 buffs that Gargos possess and gives to an Omen.
Shadow Lords File[]
"The blood flowing through Gargos' veins automatically regenerates his Shadow Gauge over time. This allows him to summon Izziks and Dretches more frequently, so be careful!"
In-game effect[]
With this buff, Gargos/Omen will have his Shadow gauge regenerating itself. As of Omen, he will unleash many Shadow attacks, while Gargos will usually summon Izzik and Dretch to assist him, making the combat harder.