Virion used to be a powerhouse solely due to his ability to provide a massive damage reduction aura when your units were under the effects of morale boost. This is no longer the case, now he is a summon bot. You can summon legions of swordsmen with his ability and this is extremely powerful as it can add two legions of swordsmen anywhere to the battlefield greatly changing the outcome of the battle.

Light’s Safeguard
When Virion’s health drops below 50%, he casts Light’s Safeguard on himself, mitigating the damage he takes by 95% for X seconds.
Light’s Safeguard can only trigger once per battle.
Get one point in this skill you don’t need any more than that.

Summon Swordsmen (costs 3 mana)
Summons a group of Footmen to assist in battle for 30 seconds. The overall Power of the summoned Footmen cannot exceed X.
Max this skill it is the most powerful of Virions abilities unless you are fielding gold swordsmen.

Lionheart Blade
Each time Virion attacks, there is a 25% chance of triggering the power of the Lionheart Blade, dealing X damage to the enemy as well as immediately healing himself for X health.
Get one point in this skill for the added damage and healing it helps.

Swordsmen Mastery
As Captain of the Guard, whenever Virion is on the battlefield, all allied Footmen, Swordsmen, and Legionnaires have damage and max HP increased by X.
Max this skill if you are using swordsmen in your army, put points into this skill if you are going to use Summon Swordsmen

Crusader Shield
While Virion is on the battlefield, whenever friendly troops get a morale boost, they take X reduced damage.
This skill was nerfed heavily It is a nice win more ability but it isn’t overpowered and game breaking anymore so I would rather put points into Summon Swordsmen for the burst damage.

Crusader Resurrection (costs 4 mana)
Virion offers up a prayer, immediately reviving X allied Footmen, Swordsmen, and Legionnaires. (Units that have fled from the battlefield can’t be revived)
Get this skill only if you plan to field Gold Swordsmen, as this makes them undying and basically gives you a free deployment of an extra gold legion.

Building Virion
Get one point into Light’s Safeguard. One point in Lionheart Blade. Max Summon Swordsmen, Max Swordsmen mastery or Crusaders shield. If you are playing human and plan on using Gold Swordsmen get 1 or 2 points into Crusader Resurrection.

Equipping Virion
Build Virion similar to Rufio as he likes to run in and get himself killed. Refer to Rufio’s item setup for a general idea