What exactly does multicast do on summons?
Multicast on Summon Features
Summon more at once. Which is pretty useful especially if you can’t heal them.
The max is usually 6-8 summons. Summoning 4 at a time at a specific location next to you is good.
Multicast also affects summons attacks, it seems.
It increases the amount you summon, but you still have a summon limit.
Also summons attacks can multicast which is crazy on chaos golems.