[Theory] Rare chest loot changed? or The Great Loot Rebalancing of 2017 or v1.4
At roughly the same time Rare elemental wanted mission chest loot was awesome, 4* heroes ( like Boldtusk ) required 4* ascension items. For Boldtusk it was mystic rings.
And 5* heroes ( like Joon ) required a single 3* non farmable ascension item ( 1x warm cape ) for tier 4. In addition to 6x MIXED 4* ascension items. For Joon it was darts and telescopes.
Merciless RNG, the low drop rate of 4* ascension items and the need to have two different colors of 4* ascension items per 5* hero must have been a nightmare for leveling 5* heroes.
Add the drain of 4* ascension items used to level 4* heroes, and 4* ascension items must have been a huge problem for early players attempting to build 5* hero teams.
Devs appear to have rebalanced 4* / 5* heroes and 3* / 4* ascension items at the same time.
Initially 5* heroes ( like Joon ) needed only 1x non farmable 3* ascension items ( 1x warm cape ) for tier 4 instead of the current 4x 3* non farmable ascension items ( 4x mystic orbs ).
While 4* heroes ( like Boldtusk ) required ?x 4* non farmable ascension items ( ?x mystic rings for Boldtusk ) for tier 4 instead of 4x 3* non farmable ascension items ( 4x hidden blades ).
So it appears they never nerfed the number of yearly 4* / 5* heroes you could ascend.
Instead Devs rebalanced the numbers of 3* / 4* ascension items needed for 4* / 5* heroes and then adjusted loot drops to allow the same number of 4* / 5* heroes to be ascended per year.
So while the number of 4* ascension items went DOWN significantly, an EQUAL decrease in 4* ascension items NEEDED was implemented.
While the number of 3* non farmable ascension items went UP significantly, an EQUAL increase in 3* non farmable ascension items NEEDED was implemented.
The current ratio appears to be 1x 4* ( darts) to 3x 3* ( orbs ).
This rebalance is still very very annoying because even Dev Tim admits Classic 4* heroes are not balanced ( see notes )
While more 5* heroes are added than 4* heroes. As seen with Seasonal heroes, map heroes, Challenge event heroes and HotM.
Click for notes
Red 4* Boldtusk used to need red 4* Mystic Rings
I cannot find the better copy someone posted on the forum ( along with old silver token graphic ), because Joon is very very popular, but here is an old Wiki image where Joon requires 4x Darts, 5x Chainmail shirts, 1x Warm Capes, 2x Telescopes