Eona by Porco

A majority of the stuff in this concept are straight up broken (some even functionally impossible to do in the game's engine, but even after putting that aside for a second):

The overall issue with this concept is that she's overcompensated in multiple ways that is unfair to play against due to her only weakness being that she's unable to kill enemy Heroes on her own. Starting from the top:

Stats: After reading through the whole concept, her Health is a lot for a Hero that can do too many things except for killing a Hero. She has more Health than exactly half of Ranged Assassins in the game despite having a potentially higher damage than most of them (her trait).

Attack Damage being 200 is also a lot. It's less than Stukov's and more than Hanzo's, but those two have the lowest Attack Speeds in the game (0.67/s). 200 damage per second just makes her overwhelming, and even though this doesn't damage Heroes (at least according to her trait), this means she can clear waves relatively fast and deal considerable damage to Forts/Keeps and Mercs.

Also why is her Mana 490? With the exception of Probius, all Mana users in the game have a starting 500 Mana. Having 10 less Mana than other Heroes is really not that much of a compensation nerf if that was the goal.

Now onto her kit:

Entropic Strikes: Permanently active percent-based damage, especially on a Support is just broken. Tank becomes extremely miserable to play into this Hero cause percent-damage ignores all armor. We do have traits in game that do percent damage (i.e. Tychus's Minigun and Malthael's Reaper's Mark, but Minigun has a set duration and forces Tychus to stay still to shoot, while Reaper's Mark is a DoT (can be healed with more ease)). Entropic Strikes is instant and is permanently active, almost no way of countering it without avoiding engagement entirely.

Additionally, it feels disconnected from the rest of her kit (I don't know where this character is from, but it's irrelevant, because even thematically based on description, it doesn't seem to be making much sense). For a Hero that's all about time manipulation, it just feels out of place.
(Also if I'm reading correctly, none of her abilities deal direct damage, meaning this is exclusively for her Basic Attacks.)

One Second In The Future: This is just overloaded even before any talent selections. Dash (uninterruptible by most means except for hard CC), cooldown reduction on all abilities (assuming it also includes Heroic Abilities and Active Abilities from talents?), reduced hostile effect duration (realistically just Slows and DoT) and doesn't dismount, on an 8 second cooldown? What's the logic behind it not dismounting? No ability in the game outside of Attack Modifiers retains mount. She becomes impossible to catch by most Melee Heroes in the game.

One Second In The Past: This is basically Tracer's Recall, but on a Support ability. Certain matchups become frustrating to play against. Imagine a Hero takes damage from Pyroblast, then One Second In The Past is used, completely nullifying that. Not to mention this is on a Basic Ability with such a short cooldown.

Time Lock: This is Chromie's Time Trap basically. It would've been fine, but the fact it's point-and-click targeted makes it unfair to play against. Once again, on a Basic Ability with a short cooldown.

Before moving onto the Heroic Abilities, I want to mention that as it stands, her kit doesn't have much synergy with itself. I understand she is meant to be a Support, but all of her Basic Abilities (and trait) do completely different things without them needing to be played in any specific order.

Rewind: Firstly, the cooldown is far too short for an ability that affects every aspect of the game. I'd make it either 180 seconds or even more.
Second, this ability is mostly feast-or-famine. Assuming that this also includes cooldowns, Health, etc., there is a high chance that this ability achieves nothing, since in 3 seconds prior, abilities might still be on cooldown and an ally might still be on the brink of death, but I'm imagining that if that is not the case, then Rewind basically makes every engagement meaningless to the enemy team (revived Forts/Keeps for example).

End of Life: I genuinely cannot tell what this ability is supposed to do.

So does that mean that it does nothing? Or does it mean that while the enemy is at 1 HP, they can be killed? If it's the latter, then this is straight up broken no matter what. A point-and-click ability that essentially guarantees a kill regardless of Health and only on a 70s cooldown is just completely unfair game design. Even if she can't kill Heroes by herself, she is likely accompanied by an ally or even Minions that are targeting this Hero.

Onto her talents, and there's a lot I want to talk about:

Eye of Future (Lvl 1): AoE cooldown reduction in level 1 is unbalanced, not to mention that it Reveals as well. I'd move this to level 16 to be better balanced.

Absorption (Lvl 4): Against Tanks, she becomes basically immortal.

Past Perfect (Lvl 7): The description is vague. Does it damage enemies? If so, how much?

Secondary Effect (Lvl 7): Does the damage from Time Lock also stack with Entropic Strikes?

Time Mount (Lvl 13): This is officially the most uncatchable Hero ever. 160% MS during mount means she can zoom across the map relatively fast. Also this remains for 1 second when unmounting? There is no way she'll ever be caught. (Also Q already doesn't dismount her for some reason, this talent makes it more broken than it already is).

Purify (Lvl 13): Way too short of a cooldown for a cleanse. Cleanse talents in the game are between 40 to 90 seconds. Plus I'm assuming her Q also reduces this cooldown?

Relativity (Lvl 16): Again, point-and-click targeted makes it more oppressive than it is. Also having it reset on takedowns is too much for a level 16 talent with an already short cooldown. I'd move it to level 20.

Rewind Again (Lvl 20): The game just becomes too frustrating to play at all cause of the constant Rewinds. The ability itself already does way too much.

Alternative Timeline (Lvl 20): Giving decoys Entropic Strikes is just broken. Tanks melt significantly faster than they already do.

Quantum Break (Lvl 20): Multiple issues with this talent: 1-With her kit, she is very unlikely to die in the first place (mobility, Stasis, etc.) 2-Talents that benefit dying are poor design in general. 3-Death Timer reduction by 40 seconds is just miserable to play into. At level 20, Death Timers are 50 seconds. Meaning she respawns in just 10 seconds when she dies with this talent. At further levels, this increases by only a small amount. Broken.

Unfortunately, this concept doesn't seem to clarify what this Hero's role is meant to be. Is she a Support? An Assassin? A tank-buster? Not to mention that outside of the broken mechanics of time affecting the whole game and that her kit and talent tree seem to have no synergy with each other, she feels too forgiving to play for what she does thanks to none of her abilities being skillshots.

Decent concept in theme, but extremely broken in terms of balance.