The Istari thing is one which has always really annoyed me. In every instance, Tolkien wrote that it was expressly forbidden for them to come arrayed in power, that by the nature of their incarnation their nature itself was limited in the extreme. The only point any of that changes is with Gandalf the White, in which his mandate is changed, rather than being the one to inspire resistance he is now given leave to actively resist and we see that with his weaponized beams of light. Word of Power is something which directly goes against his very mission.
But I digress. The topic of the Tornado is one I feel probably is far to flashy for the setting. To be honest, magic in Lord of the Rings is either some kind of technology or item based enchantment, or is wielded in nature by imbuning ones soul in the land in which you dwell. The only instance in which we see a direct combat spell is when Sauron sets Gil-Galad aflame.
However, the BFME games have their own iconic spells and flashyness. Elrond has had the tornado for years and when I think of Elrond in this game I think of the area denying support hero, who empowers other elves and forces enemy armies to collapse on a flank to let the armies of the elves outmaneuver their enemies. If we want to talk about getting back to the intent of Tolkien, then we need to be willing to do this consistently. Likewise, if gameplay is to be the higher calling we need to do that consistently so to if we want to talk about iconism.
Anyway, I am going to give another draft run of powers.
1st ability, gift of experience. Elrond is to the race of men what Cirdan has been to the elves, he gives a boost of experience to heroes battalions in a small radius.
2nd Ability; Vilya's Restoration; Passive aura that increases in power with Elrond's level. Vilya the greatest of the three rings restores the world into a pristine state. At level three, this ability increases the passive healing rate of all heroes and battalions in an area. At level seven this ability additionally enables Battalions to restore one dead member every 15 seconds. At level 10 this ability additionally reduces the cooldown of abilities by 25% for every battalion and hero in the radius.
3rd Ability; Restoration; This ability heals heroes and units by 50% within the radius and refreshes the cooldown of their abilities.
4th Ability; Foresight; Elrond is possessed of a powerful natural gift of foresight, this ability reveals the entire map for a period of time.
5th Ability; Waters of the Bruienen; A somewhat weakened version of the Anor spellbook power, this ability will knock down and wash away units in a moderate radius, with a large cast range and cooldown.
This Elrond is thus the hero you keep behind the army and he grows in power over time. With the aura, you have the option to also include some armour passives for Elrond himself, and perhaps it might be worth considering switch restoration and the aura's name. Instead association restoration with the direct application of Elrond's ring, and let the aura represent his healing prowess.
Either way, in this sense we have a firm backline hero, who provides healing and strategic support to the army of Rivendell.