My idea is, somewhere after buying hyper quests or galaxy quests maybe (?), make a quest for a soul goblin evolution. Late game wise, bonus stages are very ineffective for farming souls, and it's main purpose would be to give boosts from random boxes and armory chests for either boosts or DP.
In comparison, chest hunts give about 20x more slayer points than bonus stage (depends on luck). I think the evolution could have around 2-2.5x base souls and optionally have a type like fire so it could synergise with some items better. This way the souls gain would be on a more reasonable level but it still wouldn't be the main purpose of bonus stages.
#Late game soul goblin evolution
old kayak
regal granite
actually how about an evolution to goblin giants
old kayak
That's an alternative, if implemented well it would give a good result too
regal granite
it makes more sense to me to evolve giant
old kayak
It comes down to the same thing which is buffing the enemies of Bonus Stage, but giants could be better in some cases too
junior oasis
Or a better bonus stage in general