I've run 100 Wellspring events on NORMAL (well, actually 109 since the game crashed 9 times during the event and I had to start again) and logged every reward I got (except things like glimmer, blue/umbral engrams). I ran this over four days, 25 events a day to account for all four weapons. Two days were Attack and Two were Defend. This is the breakdown that I recorded...
ARMOR
52 Veritas Boots
26 Veritas Class Items
10 Veritas Chests
7 Veritas Helmets
5 Veritas Arms
WEAPONS
6 Come to Pass (Regular)
3 Come to Pass (Deepsight)
3 Tarnation (Regular)
2 Tarnation (Deepsight)
3 Father's Sins (Regular)
1 Father's Sins (Deepsight)
3 Fel Taradiddle (Regular)
1 Fel Taradiddle (Deepsight)
0 Exotic Glaive Patterns
Bummed about getting no exotic glaive patterns after 100 runs, but I guess that's Bungie RNG. I thought the weapon drops were really underwhelming compared to the flood of armor. I'd prefer it to be closer to even between the two.
Once I gain a few more power levels I'll do 100 runs of Master in the same fashion and log everything there too. I expect it to be a little bit better in terms of droprates, but not much.
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I got 6 deepsight weapons, 1 glaive pattern and 4 alloy from my last 15-20 master runs. Made sure to get platinum on every run.