I never did that raid in Vanilla, so I guess I don’t fully understand what the class calls did. I am just going off the article description that says…
"This “class call” is an infamous mechanic returning from Blackwing Lair, where Nefarian used it to similar effect, causing chaos within the group if not carefully planned for. In both raids, players of the targeted class temporarily lose control, lashing out at enemies and allies alike.
Unfortunately, it seems like this ability may have been too difficult to balance across 13 different classes, as it has now been removed from the encounter journal, suggesting it may be gone entirely. Although an interesting and nostalgic gameplay mechanic, some groups had already theorized stacking classes to only deal with the easier calls, while avoiding bringing classes featuring more deadly ones.’
Looking at the description some of them were silly like…
“Neltharion takes advantage of the druid’s connection to nature, forcing them to shapeshift to a random form every 6 sec. for 30 sec.”
or
" Neltharion takes hold of the death knight’s powers of undeath, forcing them to death grip allies to their location every 6 sec. for 30 sec."
But then you have others which are going to be horrible like…
“Neltharion forces the demon hunter to erupt in a chaotic dance of blades every 6 sec. for 30 sec, causing them to inflict 83,222 Chaos damage to all creatures and players within 8 yards multiple times.”
“Neltharion corrupts the flow of arcane energies in the mage, forcing them to erupt with Wild Magic every 6 sec. for 30 sec, inflicting 83,260 Arcane damage to players and creatures in 10 yards every 0.5 sec. for 4 sec.”
" * Neltharion corrupts the monk’s essence, splitting three spirits from them that attack outside of their control, and leap to random players with Flying Spirit Kick. On death, these spirits erupt with Unleashed Darkness.
- Unleashed Darkness -The death of a creature summoned through Neltharion’s manipulation of corrupted players explodes for up to 416298 Shadow damage to all creatures and players in 10 yards."