The new skill didn't have any visual effect on the appearance of his eyes, unlike its predecessor. Arthur didn't care about that, he was delighted to see the significant increase in the efficiency of the skill, once he activated it, he could clearly see the Death Energy.
Not only that, he could also distinguish the Mana from the Death Energy, he could see farther than ever before and was able to witness the process of absorbing Mana.
Small blue particles were entering his body, this was thanks to his high Mana recovery, which allowed him to recover more than he spends on the [All Seeing Eyes] Skill, which cost ten thousand Mana per second.
It is barely 10%, if not less, of his Mana Regeneration, so he could permanently use this skill without losing anything.