Shrikewood was up in both March and May, containing the two shields you needed. There was a shield in level 10 of Springvale. Avalon in May and Wonderland, which just happened a bit over a week ago, each had shields as tier completion rewards.
So in those 4 months, there were 5 guaranteed shields available in-game.
As far as what affects loot drops the lead designer of E&P has explicitly said that there is no dependence on anything like roster:
Is there a variable controlling how mats drop? Like this month they might be less frequent and next month more frequent? Is there a wave of how they drop? As far as I know, no.
This is like the question of whether boards are random.
There are fixed percentages for titans, for rare titans, and so on. It’s very unlikely that we have changed them; we usually haven’t changed the probabilities since the feature has launched. For example, rare titans and chest, as far as I know these have had the same odds since the beginning, and they shouldn’t be affected by the position of the moon or anything. [Laughter] The odds of pulling 4* items are so low it’s hard to see any patterns, but we haven’t changed anything.
Petri : And we all play the game here, and we all have the same frustration.
Kira : So someone here (not naming names) has fewer yellow heroes and like 30 magic orbs, and that’s all she gets. But for me it’s, “I need your orbs, please!”
Tim : There is no hidden “fail safe” which is how you can get players who have some weird streak, some unbelievable run, but we decided from the beginning not to go that route. There are a lot of issues trying to make such a system good for everyone, so if you get a 4* mat you just get whatever random mat comes up [without reference to what you need or have in inventory]. So players get some really interesting [runs].
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