Helios only paid half attention to the girl's welcome speech. As they'd drawn closer his sense of the magic hanging over the camp had grown stronger and stronger. And yet, it dangled on the edge of his perception, understanding remaining just out of reach no matter how he strained. It was both strange and frustrating, the first time he'd experienced something like this sense he'd had his eyes opened to the mystic. It was almost like...

It came to him. It reminded him of a carrot on a string. Something being dangled in front of him, but always pulled away just as he reached for it. But if that were so, who was the dangler?

And with that thought, he stopped straining his senses only to realize that he recognized the aura that permeated the camp. "Death magic."

He reached for a magic of his own. Heat and cold were opposites, and where the two met they canceled each other out. So too were Death and Life, polar opposites that were at odds with each other on the surface. But like heat and cold, once one delved a little deeper they learned that the two were really just different temperatures, opposite poles of the same phenomenon. So Helios gathered energy from the camp that seethed with Death energy, but instead of bending it to necromancy he wove from it a different Aether.

The spell he wove around himself and his companions like a light, thin golden sheen. Imagine a dreary day, one where you feel awful, everything aches, motivation is zero and you just want to crawl into bed. Compare that to a great day where the sun is shining, you're full of energy and even just the colors of the world itself seem more vibrant. Now take the difference between those feelings, that vibrancy, amplify it, and wrap it around you like a soft blanket.

That was the feeling of being wrapped in Helios' Lifeshell.

"If your intentions are peaceful, show yourself!" he called, adding to the chorus.

Spoiler: OOC
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Casting Lifeshell on the party. He'll shape the area to affect each party member, so everyone gains a Triggered Restorative Healing 10 SE 6 effect that will go off when/if the character is attacked. Its not exactly cancelling out any effects of the death magic here, but mechanically it should blunt or undo an incoming attack so the end result seems much the same.