I tried playing on a large map with Nimue, aiming to reach level 40, obtain the Master of Gates artifact, and equip a set that provides a 25% bonus to additional summons, to see how many demons she could summon. The standard reinforcement ranged from 132% to 133% of the main unit, while a successful summon resulted in 189% of the summoning unit. However, I still couldn't fully understand how they calculated these values. It's 45% for Absolute Gate Opening, 20% from the Master of Gates, 40% from Nimue's level 40 specialization, 10% for the Chaos Gate in the castle, and 25% from the set for increased summons. If you add it all up, it comes to 140%, so it seems they weren't simply adding everything together, but sometimes taking percentages from certain sources. With a successful summon, it's clear that it only doubles the initial amount, without any additional summoning enhancements. However, the summoned army is impressive at these levels for Nimue, especially when combined with Urgash's Call.