@ZOS_GinaBruno @ZOS_Finn
TLDR: Mathematically, the Master's Destruction Staff underperforms when compared to Maelstrom staves and even non-set staves with the Weapon Damage enchant. Considering the difficulty of the content involved in obtaining Master weapons, the enchantment should be potent enough to warrant the effort.
Suggestion: Increase the max magicka bonus to 2000, the damage bonus to 750, and the cost reduction to 20%.
Simple comparison of Spell Damage Bonuses (assuming a 10:5 Magicka:Spell Damage ratio):
Non-Set Staff with Weapon Damage Enchant = 348 / 2 (5 second duration, 5 second cool down) = 174 Spell Damage bonus
Maelstrom Staff = 189 Spell Damage bonus
Master's Staff = 1032 magicka / 10.5 = 98.3 Spell Damage bonus
IF INCREASED TO 2000 magicka / 10.5 = 190.5 Spell Damage bonus
(to be exactly equal to Maelstrom, it would need to be 1985 magicka, but a round number would be nice, and just a hair stronger would be valid)
Concerning Destructive Touch and the Master's Staff bonus:
First, just to get some actual numbers to work with, these are the tool tip values for Shock Clench and Blockade of Storms on a Sorcerer with 48574 magicka and 2615 spell damage. The values themselves are not important, only the comparison between them. We also won't consider crit, as it effects all skills equally.
Blockade of Storms: 2611 cost, 2211 aoe dot damage over 8 seconds. Total damage: 17688 / 8 = 2211 DPS. Cost/DPS ratio: 1.18
Blockade with Maelstrom: 2611 cost, 2211 + 1341 = 3552 over 8 seconds. Total damage: 26040 / 8 = 3552 DPS. Cost/DPS ratio: 0.73 (160% stronger)
Shock Clench: 3070 cost, 5306 initial damage, 8120 dot damage over 8 seconds. Total damage: 13426 / 8 = 1678.25 DPS. Cost/DPS ratio: 1.83
Shock Clench with Master: 3070 cost, (5306 + 516 = 5822) + 8120 + (516 x 8 = 4128) = 18070 / 8 = 2258.75 DPS. Cost/DPS ratio: 1.36 (130% stronger)
WITH +750 AND -20% COST: 3070 - 614 = 2456 cost, (5306 + 750 = 6056) + 8120 + (750 x 8 = 6000) = 20176 / 8 =
2522 DPS. Cost/DPS ratio: 0.97 (150% stronger)
This change would provide a closer DPS increase and Cost/DPS ratio to what the Maelstrom weapon provides.
ZOS Team, please consider implementing the above suggestion to help incentivize the use of Master Destruction Staves and the Destructive Touch skill. A full review of all Master weapons may be worthwhile, but this is the only one I know enough about to offer suggested changes.
P.S. I'm not entirely sure if the extra damage bonus from the Master's Staff applies to the initial hit as well as the dot damage. I assume this in my calculations, but even if it doesn't, I don't think it makes enough difference to alter them.
P.P.S. I may be mistaken thinking that ZOS_Finn is the appropriate person to tag. I couldn't remember exactly who the itemization person is, so if anyone remembers, please tag them too.