Hmm, that makes sense.
You will continuously have a sword for your level, but it won't be overrated.
It's certainly strong, but I'd argue in the way many weapons in Dark Souls remain strong from early game to late game. It still takes skill to employ it well.
Pros:
Basically, it "powers up" based on the number of enemies you kill without taking damage in return. There are 10 "charge" levels, and you receive a +10% bonus to both damage and critical chance for each level. When you get to +100% damage, +100% critical chance, it maintains its charge (and cool glow-y effect) until:
- you suffer damage.
- the charge counts down over time.
- you level up.
When you level up, you'll also lose your accrued charges, and the blade will receive a
permanent increase to its
base damage, meaning you can continue using it indefinitely throughout the game. (You'll never need to replace it with higher level gear.)
You can upgrade it to have 3 rune slots as well, so it can be used to significantly augment other skills.
Cons:
It's a weapon that requires a very particular playstyle from the player. It almost begs the player invest in Quen and keep their passive shield up at all times, spending stamina / adrenaline points on it almost constantly to ensure they have a buffer if they slip up. In order to take full advantage of it, Geralt cannot
ever be struck.
That's quite a challenge...especially against multiple opponents, when it's arguable it would be the most useful. So, in situations where the sword would arguably be most beneficial, it also demands more of the player.
I've only used it on one playthrough, but I felt it was not unbalanced at all. Yes, you're a glowing whirlwind of death when at 10/10 charges, but getting there is still challenging. Also, if you're like I am and try to pace fights according to a tempo, so you can be reasonably sure when you're about to get a killing stroke
, having the damage constantly shifting around can actually be a bit disorienting.
So no, I would not say that it's overpowered at all in practice. Plus, it's tons of fun to use.