Improvement: Make -PDR and -MDR Options

[Bakelt]

This is this the reduced resistance stat found on conviction, amp damage, and decrepify.

Physical Pierce and Magic Pierce do not exist. We need reductions available for classes that rely on Phys/Mag

Barb (phys)

• Battle Cry (complete Class Rework - Singer Barb #294)
• Do we want a Mastery option?
• Do we want a Combat option?

Druid (phys)

• Spirit of Barbs (complete Merging druid rework #233)

Amazon (phys)

• Add -PDR to Inner Sight (complete NM-Hell Rebalance #323)

Necro (mag)

• Add -MDR to Weaken (complete Necro Rework - Blood Golem, Blood Mana, Bone Skills #369)

Paladin (phys,mag)

• Add -MDR to Sanctuary and flat magic to Holy shield that synergizes to Sacrifice and Zeal. (complete Paladin Further Tweaks #529 )

Assasssin (phys)

• Trap/Shadow?

[Delegus]

Necro MDR on weaken, seems like a good way to incentive curses other than decrep and lower resist and put a difference between playstyle feeling from summoner/bone/poison.
Paladin blessed aim for PDR; and honestly Conc aura for MDR, since only hammers is going to care anyways and putting it on something else doesn't feel right, maybe 1% per hard point up to 25% total, since sunders are being re-added that would still leave an immune at 70% resistance;
Assassin blade skills and dragon claw as a synergy from blade shield, + dunno for the Wolf assassin users, might look into adding wolverine oSkill to that unique claw. Bonus, with -PDR the blade skills may feel good enough not to need further investigation.

[Bakelt]

Weaken I like

Blessed Aim I am hesitant about as A2 merc gets it but I'd have to look at other options

Conc may be the right call but it doesn't benefit HB/FoH. We could attach it to two auras at different power levels so that one is more tempting for hammer and the other for HB

Blade shield feels like a good choice as it "shreds" resistance. Can make it castable in werewolf easily as it's just a Restrict parameter in skills.txt

[Bakelt]

Also need to double check if some of these are too accessible elsewhere as merc auras, oskills, and equip aura.

[Delegus]

Conc may be out then sadly, but might have to synergy into hammers itself, IIRC Holy Bolt and FoH are their own "holy" damage type aside from the lightning aspect from FoH initial and wouldn't benefit from -MDR