Not worth the effort

[TomV93]

I like this suggestion more than the suggestions about obtaining a desired hero by choice.

We already get the chance to obtain guaranteed non-random ascension materials by finishing Rare Quests, Challenge Events and Seasonal Events. During the year’s cycle we can obtain what we desire. But as the OP has mentioned; we may desire more of a specific item due to the randomness in obtaining heroes.

An Event which allows us to choose the ascension materials will help those who have hit the progress wall. But the, sometimes, scarcity of resources is part of the game and in my opinion should stay part of the game. For this reason:

@JonahTheBard

There is, therefore, an element of ‘luck’ which induces high emotional swings in invested players. By inducing periods of frustration and disappointment, the game also manages to increase the feelings of elation that follow victory or receiving a positive item or hero.

Written in Play for the Puzzle, not the Empire.

I would add to this suggestion not to not change much about this scarcity aspect, by having a low frequent appearance of this type of Event. Say, for example, 4 times a year/every 3 months.