Hydrogen

Hydrogen is the lightest thing in the periodic table and one of the more approachable Epics. Added with Boss Raid Chapter 2 and credited to BabySharkDoDoDo8125, it rolls at 1 in 1,111 with no biome, so you can expect about 1,100 rolls at 1x luck and around 110 at 10x. The number is simply the digit 1 repeated, in line with the element's place at the top of the table.

The Sol's RNG Wiki describes a plain-looking aura: a small fog rises from the floor and fades, the player floats a little above the ground, a red glowing nucleus sits at the torso and one small electron whips around the player. The font is Michroma. It is also noted as only the second aura named after an element, with Copper as the other, and the second most common aura that comes with a custom player animation.

Crafting entries on the wiki include Cell Asteroides at 1,000. If you want a quick science-themed pickup before the harder auras in this letter range, this one fits.