Level 10: Vilya's Preservation - All heroic abilities in the vicinity of Elrond are continously restored. Buildings, units and heroes in large radius are immune to fire. All allied forces on the map are protected from magic for a long duration. Left click to activate.
Suggestion battle begins!
To be serious - I've switched that and added fire resistance. I still fear that armor bonus for base would be OP.
We're still mirroring Nenya, but in different way.
Closer to Vilya and Elrond, stronger the effect.
- Rank 10: Nenya's Cleansing. All allied units and buildings on the map are continously healed for a long duration. Units in the vicinity of heroes with Gifts of Lorien additionally become fearless and can't be knocked to the ground. Buildings in the vicinity of heroes with Gifts are immune to fire.
I still think that Vilya is currently on the same level of power like Nenya. Maybe even more powerful, cause in Nenya's case there are limitations concerning Gifts heroes.
I also think that fire resistance should be implemented in all three rings (For structures through gifts heroes in case of Nenya, Narya's fire resistance for Gandalf, and fire resistance for all in Elrond's large radius in Vilya's case). Fire and light were for Tolkien something what is for us magic. I can clearly imagine that preservation power of three elven rings meant protection against fires of Mordor or Isengard.
Preservation is very important trait of
Vilya, maybe the most important.
Resistance to
Narya, cause maybe only thanks to Narya Gandalf resisted to evil and kept fighting, and as only one Istari fulfilled his task.
And
Nenya's
cleansing, because after destruction of Dol Guldur, thanks to Galadriel forest was cleansed.
Edit: I would accept global effect for restoration as well:
Level 10: Vilya's Preservation - All allied buildings, units and heroes on the map are protected from magic. Main base is additionally immune to fire. Heroic abilities are continously restored for a long period. Left click to activate.
Edit 2: And I would risk restoration of unit abilities ... cause it really fits to gameplay and logic behind the concept. After all Arwen heals actively (ability) and passively (spellbook spell) too, so why her father shouldn't?
Now without fire resistance effect.
Level 10: Vilya's Restoration - All heroic and unit abilities are continously restored for a long period. Buildings, units and heroes on the map are protected from magic. Left click to activate.
Edit 3: But possible would be also this:
Level 10: Vilya's Preservation - All heroes and units in the vicinity of Elrond are continously healed, their abilities slowly restored and along with the structures protected from magic for a long period. Left click to activate.
It would mean return of vanilla restoration, although slightly reworked with additional effect. While Nenya means global healing with Gifts heroes and their bonuses, Vilya is centered around great healer Elrond who protects his realm agaist enemy magic and overall preserves it thanks to elven ring.
We all know that healing fits to Elrond and fits to Imladris, to Middle-earth spa. Our intentions to beat Nenya were pointless, cause both rings had probably the same effects (only Narya was used in different way - more actively and not centered on one place). We can only assume that Galadriel used Nenya more cleverly to protect her realm, so global effect over the whole forest (faction) quite fits. Imladris was small place, so reduce Vilya's effect on ring bearer vicinity is also quite logical.
If you look on Elrond's full skillset ... heal, restoration, and some additonal effect worthy of ultimate ability (magic) were something that was missing, and now everything is included in one last ability which highlights his role in the faction while his mass slayer role is unchanged.
Edit 4 (and hopefully the last one):
If you want to focus on siege, than pure recyclation of Lorien fortress upgrade would also be fine and even balance wise (cause it only affects siege attacks, and not all spellls, units, heroes like invincibility).
Level 10: Vilya's Preservation - Hidden refugee is immune to siege attacks for a long period. Inside the base heroic abilities are continuously restored.
Left click to activate.
Together with restoration we're really creating hidden sanctuary where heroes can rest and recover without fear that enemy will break the gate.
Edit 5 (and certainly not last)
... but I like it the most to be honest.
Level 10: Vilya's Preservation - Magic of the mightiest elven ring preserves Imladris from evil influences. All alied units, heroes and buldings on the map are immune to magic, fire, frost and poison. Heroic abilities are continuously restored for a long period.
Left click to activate.
And for Gandalf's Narya only resistance to fire and frost, it's regular stance after all.