Version
Fabric 0.14.8, mod version 1.6.2

Origin
Broodmother

Power
Newborn Fighters

Notes
The description says you can summon some spiders to fight for you, but they don't target other mobs and just kinda chill out. They're cute and I love them, but they aren't very useful.

I've been working on this, but I can't seem to get it to work - it appears that the spawned spiders are neutral and don't attack anything

There is a spawn event that would do this, but it is only available in Bedrock

As for the Need Help tag, if anyone knows how to summon spiders that are already aggressive, that would be very helpful

Closing this as I don't think I will be able to fix this. Spiders will spawn and may still attack, but will not be guaranteed to be aggressive.

I recently spent some time working on this issue, I dug deep into the origins discord and found an aggro power that works pretty well, it's not perfect, but a good step forward. I've implemented it into a modified version of the broodmother here: https://github.com/EvanoriMemoria/ReincarnationOrigins/tree/master/src/main/resources/data/reincarnation-origins/powers/broodmother

broodmother/aggro and broodmother/summon_the_army are the two primary files that interact with aggroing your minions, though I added a bit to broodmother/websling too. The primary issue with it is the invincibility frames, if we could get rid of those we would be golden! I also added knockback resist to the minions so the fake damage doesn't interfere with them as much.

It should work even better in newer versions of origins with the Selector Action: https://origins.readthedocs.io/en/latest/types/entity_action_types/selector_action/