Maxed upgrades questions

Currently at Timeline 877 and have maxed:

•	Hero gear

•	Skills

•	Legendary / epic / rare cards

•	Standard rune tree

•	Infinity damage rune

Trying to understand how the endgame systems scale from here.

A few questions for players who are further along:

1. Does maxing hero gear and skills change the odds for extreme / very hard hero missions? I assumed it would, but I’m not seeing a difference.

2. Once everything is maxed, hero missions and boss dungeons still give gear, blue potions, and keys. Is there any conversion system later on, or do those just stay unused?

3. Zombie Dungeon (81-1 onward) is giving 450 gems. I’m at 89-8 and it hasn’t changed. Does it increase again at 90-1 or 91-1, or is 450 the cap?

Just trying to understand what progression looks like after maxing core stuff. If I’m missing something obvious, let me know