Roger brings up critical balancing concerns, and Demogorgon's opinion seems trustworthy. That kind of bonus to damage reduction would make it hard to justify.
The first feeling I get when considering introducing this is for
custom content. What if it weren't permanent? ^o^
To push the idea further, if you had a custom wing or armor that gave a Lvl 1 Property, it could ascend to Lvl 2 / 3 / 4 similar to how this armor procs:
Mithril Magic Cape
We could consider this when designing custom mobs with
multi-elemental property offense, and make the activation trigger from receiving a different property.
*Earth 1 becomes Earth 2 when damaged by Wind or Undead Attacks.
To expand on the idea further:
Player
- Armor or Wing with Lvl 1 Water Property
- Elevates to Lvl 2 @ % chance when taking Poison or Undead damage
~ vs ~
Content
- Auto-Attacks are Fire Property, Poison, or Undead
- Consistent Fire / Poison / Undead Property Skills
I find difficult content tends to require a Sage or Scholar to help support,
and I'll be honest I'm not a big fan of SP Battery being their Primary function.
Deluge, in this case, will boost the Tank's HP, while increasing the duration of
Blinding Mist.
This increases the tank's damage mitigation by raising their HP by 15% and, due to Blinding Mist's upkeep being easier (and thereby encouraged), raises tank's avoidance from damaging offensive skills.
This further provides the benefit of +% Damage w/ Water Property from Storm Gust, Cold Bolt,
Freezing Spear, and
Mild Wind Water induced Estin / Esma / Estun
to name a few.
If the armor proc'd, it'd temporarily lower those fire hits from 50% damage taken to 25%, but also the Undead and Poison by an additional 25% reduction.
I digress.
Joe's proposition can still be strongly considered under the right settings. The "Experience > Theory" feedback both Demogorgan and Roger bring to the table are also invaluable.
Let's brainstorm more! >:D