Nuclear's stability passive is stupid. A mechanic that lets you get stronger overtime at the cost of max HP just straight up sucks, and it's only good when you're between 65% and 80% stability anyways, being the strongest you can get while having manageable health. One issue with this is: sometimes, you HAVE to take hits. Some abilities are practically unavoidable, such as Stardust's laser, dealing almost 50 damage, and those can very easily invalidate the ability entirely. Also, losing your survivability isn't a great reward for surviving a long time. This is why I'm suggesting a rework to the "Stability" passive.
Instead of being called "Stability," Nuclear's reworked passive is called "Unstable."
Unstable:
• Damage dealt to you and dealt from you is increased by 25% (Rounded up to the nearest 1 damage.)
While this would be a simple rework, it would make Nuclear much more reliable and able to survive if you play well instead of you having what is basically a 5 minute timer before you die.