Essence of theAdaptable

Humanity is nothing if not adaptable~.

Adapting to your circumstances is what you do best, in all scenarios you adapt to better survive and thrive but in different ways.

Offense: the properties of your attacks shift and adapt to do more damage to your foes, mitigate their resistances and bypass any of their immunities. It won't matter how exotic, absolute or comprehensive any defence you come across is because you'll bypass them with exposure and time. Additionally, it's not just punching through defences but you also develop the needed properties & attributes to deal increased damage against your foe; like developing the Anti-Demon attribute to fight against demons, Anti-Immortal against immortals, Anti-Dragon from battling with a dragon, Anti-Undead against the Undead & and so on.

Defence: you adapt and evolve against any/all negative phenomena you're subjected to. And not specific counters either, ones which reach widely! Get cut? Adapting resistances to being cut by any means. Lit on fire? A full on resistance to extreme/high temperatures and burning. Hurt by magic? Resistant to all magic! This Essence can grant immunity for something instead of resistances, but you'll adapt to what you encounter and its power but not more; get hit by magic? Then magic of that potency and lower won't be able to affect you negatively again, but magic with more potency will affect you, even if it's less effective than the caster might wish. Simply put: you're hit by a spell worth 100 points & survive it, 2 more spells come flying towards you, the first is worth 99 and the second will be worth 110: the first spell is fully negated because it's weaker than your resistance's power but the second spell does 10 damage to you because it was stronger than your at the time resistance but was still reduced by it's strength and your resistance to magic is now 110. Get it? To gain immunity you would need to encounter and survive and endless/infinite potency of something, you'd need to survive the touch of Death itself, a powerful abstract entity, to acquire a full immunity to death and deathly forces and effects. Good luck with that~.

Growth: you gain more powerful in response to need, slowly but surely. It's not instant or even fast, but it's present all the same. From encountering challenges that need a higher amount of raw 'stats' than you possess you will start to grow to meet those challenges, stronger, faster, clearer and faster thoughts, greater willpower and self discipline, higher reserves of energy and their faster recovery, etc. speaking of energies…

Energy: you gain an inner mystical energies pool that's… useless, utterly useless, at first at least, as it also adapts as you do to fulfill all your energy needs. You encounter some new form of magic? It adapts its properties so that you can learn and use that magic & the same hold true for any other ability and technique you might learn in the future. If it can be leaned by anyone who has a specific energy source then you'll be capable of it as you encounter it. Abilities that require being part of a certain bloodline aren't applicable, for example: you can have demonic power from DxD when you encounter it but not the clan traits like Power Of Destruction, use the Chakra of the Naruto setting but not any of the bloodline abilities.

Utility: it's not just all attack and defence, it can also be more mundane things like if you went swimming you develop the abilities to breathe underwater and endure crushing pressures, or see in the dark, need less food from starving, developing new and esoteric sensory methods, supernaturally powerful instincts, inbuilt lie detection methods, etc.

Healing: because most of this Essence asks that you survive an experience, you'll gain a powerful regenerative healing ability, strong enough to reconstruct your entire body from one cell, heal your soul from any damage or pull a fractured mind back together. Using it will make it grow stronger, faster and do so more efficiently. It will heal you from any/all negative phenomena and states, which can include: curses, transformations, diseases, aging, incorrectly healed injuries, a mental disorder, atrophy, etc. as long as the tiniest piece of your body, mind or soul exists then it fully reconstitutes itself then rebuilds the other 2 aspects of your existence that you were missing. To fully die you need to be so completely erased that not a sliver of your body, mind or soul exists to recover from. A tall order with your ever increasing healing and resistances.