Yes, it was really interesting to learn how the probability of a spell failing is calculated, depending on the number of goblins!
Let's say a 15th-level necromancer uses the "Enslave" spell. An orc has 500 goblin shamans. What is the probability that the spell will not work as intended?
45% chance that the enemy's magic will be reduced by half when calculating the spell's effect;
the same chance (45%) for the spell cost to be doubled;
15% chance that the goblins will be pushed back on the attack rating scale, and if it has a curse effect or deals damage, it will affect the goblins, and the caster will not spend mana.
Added 2 minutes later
For example, let's take 10 archmages and a 15th-level mage with skilled chaos magic, who wants to cast "Ice Ring."
625 goblins will block the archmages' "Fireball."
Added 3 minutes later
Then it should be +18 for 100%.