"only XL-2"

There was a clear plan here: drench them with rain and then resurrect them to fight the remaining forces. That's why I didn't think it was necessary to bring the other 4 horses, 1 angel, and some meat into the battle. I only thought about blinding them later.

It happens. Berserk + oil, then running around the field and using combat spells. If the first speed is high, the Vivs might not even get a turn. That's what happened with my bears – the opponent couldn't hide one of the snakes, the bears killed it, and then immediately got morale-boosted, giving me a turn and a chance to retreat.

As for blinding, the most brutal option is to cast Blind, summon elements using all your mana (leaving enough for 3-5 more Blinds), then have all the elements wait (mandatory), and then attack in reverse turn order. The trick is that the Vivs, while blinded, are also considered to have waited, so they don't get a turn immediately after the Blind wears off; they wait until all the elements have had their turn. On the last element, cast Blind again so they don't get a chance. Repeat in the next round. You don't need any troops at all, just mana and spell points (and high initiative).

If you do have troops and they are faster than the enemy stack (or you can make them so), then do the opposite: Blind and oil the opponent, give haste/bless to your desired stacks, and then attack in normal turn order. On the last fast stack, cast Blind again.

A multi-turn "hit-and-run" with Blind is also possible. For example, if you have 10 angels, divide them into 1-1-1-1-1-4-1. Use the first angel to absorb the retaliation, then attack with all of them, and cast Blind on the last turn. Repeat until you run out of single angels, then finish with a combat spell and retreat. If you have enough mana, you can also reduce their defense with Disrupt beforehand. In total, you sacrifice 5 angels out of 10, dealing a total of 8+7+6+5+4 = 30 hits from the angels + a combat spell. This is used when you don't have the opportunity to hit-and-run several times and only have one chance.

An exotic option is "drink-and-run": attack with high initiative and 6 units of Witch Coven, cast Blind, drain all their mana, and retreat.

In general, it's not worth taking risks, and even if all your combat power is concentrated in one stack, it's best to add 6 more stacks of meat just to prevent these tricks from working.