A yellow sphere-shaped barrier wraps around the body of the user, defending them from attacks.
Cobalt Castle Infiltration
Seeing the strength of the Cobalt Golem, Hardcore Leveling Warrior used Lucky Coin and then picked three cards, one of which was the Immortal Barrier skill. He used the Immortal Barrier to defend himself from the Cobalt Golem's Mana Emission attack.
HCLW using Lucky Three! Three Cards (Episode 55)
HCLW using Immortal Barrier skill card (Episode 55)
Immortal Barrier protecting HCLW from Cobalt Golem's Mana Emission skill (Episode 55)