Element list:
Blood/Physical
Arcane/Magic
Fire
Ice
Lightning
Water
Earth
Wind
Holy/Light
Shadow/Dark
Poison

Those are the elements that can be utilized by elementally attuned beings like Nekomata, Kitsune, Cloud nymphs and such. There are other much more worldly elements which are either nearly impossible to control or are very dangerous and difficult to use.

Abyssal (Basically does damage directly to the soul, bypassing it's usually protecting barrier. Soulcatcher's energy drain techniques, Soulbeam and a couple other taboo arts are capable of inflicting this element.)
Void/Dimensional (Its what blackout projectiles are made out of, it's also used for most of the projectile summoning spells bosses like Lyza, Yi and such use. It's more of a utility element than a damage element. It essentially doesn't do damage so much as it simply removes whatever it comes into contact with from present spacetime.)
Chaos/True (A wildcard element often used to bypass elemental resistances and magic defences, but unlike abyssal it does not attack the soul directly.)
Order/False (Is only stopped by magical defences, it's basically the inverse of chaos/true damage. This element is VERY rare, only Porrum is known to be able to wield it. Basically though, if you have a big shield and plate armor, but no magical resistances- you might as well have tried to tank this attack naked. it would accomplish exactly the same.)

Fusion elements: (These are elements that are a combination of pre-existing elements. Usually the Afterlives energy source is comprised of this sort of element.)
Archonfire (Fire and ice, the sensation is described as burning via frostbite. Esperia, Naxon and many Heldathians use this element. It is the Energy and source of heldathian Power, enough exposure and quantity in one's body will malform some of their features, such as darkening the sclera and in some cases, tanning the skin. It's appearance is usually of a blue flame.)
Netherlight (A mix of Light and Arcane, it's described as a pleasant warm ray of sunshine when used positively, and a panful sting of heat heralding dread when used as an attack. It's utilized by many of the Guardian Angels and other roles among Galvana- which is what it is the power source of. Svoli's divine spears are good examples of it in use. It usually appears as either pale yellow, pale blue or a mix of the two (see the trail on Angelica's Spear of Rostrades)
Atomic (Combination of Fire, Shadow and Poison. It's only known wielders are Tiramisa and Xaramitsi. it appears a neon green plasma.)
Apotropaic (Comprised of Fire, Ice, Lightning, Water, Earth, Wind, Light, Shadow and Poison, it appears most commonly as a rainbow given form. Nikki Hirogashi's Tetra Blast and most of Svoli's apotropaic natured attacks use this element. It's also the element of the Gatekeeper, Tatanya and Fatty Mclarge's ultimate though self-destructive technique.)
Technomantic (A mix of lightning, arcane and light, it is the element often utilized by hackers such as Mal Morris. Fyori's Alpha Strike ability uses it, too.)
Divine (A mix of Fire, Lightning and Light. It appears in a similar way to what Archonfire does, only electrically charged. It's what the Blue Sun is made of, it's the element Yi is most commonly seen using and is also both Origin's power source and resultantly, that of the Galaxion's pre-fall. Galaxion Alpha Strikes use this element.)
Monochrome (A mix of fire, shadow and light. Used exclusively by the members of Corporation XVI and Niirgo / The Aspect of Erasure. It appears visually as a harsh contrasting flame of black and white.)
Eldritch (A mix of arcane, blood, shadow and poison. It's used more or less exclusively by Xaela and the higher-ranking cthonic monstrosities at her back and call. it appears as pitch black with a pink sheen, glow or outline.)
Scarlet (A mix of blood and shadow, it's used primarily by the Demon Lords, Astaroth and Red/Mischevia. Scarlet was one of the primary ingredients Astaroth used to create the Scarlet Price, a curse she used to permanently and post-actively weaken all human species to be fickle and easily manipulated by higher powers. This is one of the reasons Humans in general are so weak compared to most races, with a few far-flung exceptions to the rule like Nikki Hirogashi or Mira Crowspeaker who had to train their entire lives to outperform the dehabilitating curse. it appears typically as a black branch-like material surrounded by a birght deep red sheen or glow.)

Lore-relative elements.
Glitch (A very rare element only used by Glitched beings, such as Xali, or alternate timeline "Wizard". It's not a damage element so much as it is able to re-write or more often corrupt the code of that it touches.)
Adminius (An element wielded more or less exclusively by Administrators and Secretaries. It's most known use is that of webs, the element can both only be created and destroyed by the one who makes it, thankfully it is incredibly rare to find anyone able to use it. It is a very unknown of element so we don't know how versatile it is beyond making Divine Webs, an inferior version of it might be what the Mamix was crafted with.)