Hey folks! I love sorcerers, and I love the summoner archetype, but for some reason there's no real way to integrate the two RAW. So, I created a homebrew subclass that gets their powers from a bond they make with an extra planar being. 

I stole the Steel Defender as the 1st level class feature, and I built a creature summoning ability into the class using sorcery points as a resource instead of a spell. I feel this would give the feeling I was going for, someone who summons creatures and then stands back and supports them while they do the work. 

You can find the subclass HERE: https://www.dndbeyond.com/subclasses/1036412-eidolist

I'd love some feedback on this, including things you think could be added, subtracted, or changed to balance it out. I really want this to be a viable subclass without being over/underpowered. Let me know!

We've needed a summoning subclass and you've made a great one I think that commanding that many eidolons should take a bonus action since being able to throw those at something shoot a melfs minute meteors and cast a fireball all in 1 turn is kinda strong but besides that you did great and it's beautifuly worded 

An immediate suggestion would be to consider renaming it. This will avoid confusion with the already existing, CR 12, monster called Eidolon. 

Also recommend the name-change because it doesn't fit what the feature describes. An eidolon is a phantasmal image of a person's eidos - their spirit. Basically, it's a type of ghost. Your current choice of name is the equivalent of naming it "summon a goat" and have it materialise a dragon. It doesn't match at all and is a jarring name choice.

And beyond this the summon spirit feature is broken and inconvenient. It's broken because you've basically said the character can summon 1 to 20 of them instantly lasting 2 to 6 rounds. This is th strongest summoning ever featured for PCs in D&D history. The statblock is fairly decent, too, so having several (with pack tactics too, JFC) and you have this insanely powerful - superior to any conjuring spell in D&D - feature at 1st level. Oh my god.

You've also failed to account for multiclassing - like the buffs they'd get from a School of Conjuration Wizard. 

Bear in mind as well that you've already given them a superior version of Steel Defender - a 3rd level Artificer (Battle Smith) ability - at 1st level. 

Basically, your 1st level character is equivalent to a 6th level character, at least, by this point. And I've only gotten to these 1st level features. 

OK. On to 6th level.. This Bolstered Summoning, is pretty OK. I feel a bit iffy about the advantage to all saves vs AoEs, but the rest is great. 

14th level - quite decent. Very appropriate for the level, in terms of balance. 

18th level - Nice feature, not OP but might need to be reworded a bit. You say they merge with you and so this implies you're now one being but then say it cannot act, which means you cannot act. This is obviously not the intent. Might be better to describe it as merged into one body but you have control, etc. Also if you're keeping the summon spirits feature in its insanely broken state then the "advantage to attacks" is pointless, as you're able to summon up to 18 of them all with pack tactics and decent enough attack stats. 

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So, I really like the flavour of it and yay conjuration, but your 1st levels are seriously beyond insanely overpowered and broken as all "I have an I-win button" fluff.  But the other features are decent and well made.

I love the concept but it would be drastically better than every other sorcerer subclass and it wouldn't be close.  That tends to be the issue with homebrew though.  It's very hard to balance awesome ideas with how much power it provides.  It needs to be at least the same

Maybe give it one Eidolon with interesting things you can do with it using your action and sorcery points.  Giving it an expanded spell list that includes some of the new summoning spells would also be a good inclusion. 2 summons on the field would be ok, but what you have right now makes it a nightmare to play with, have at your table, and DM against.  It takes all the nightmare of playing a necromancer and makes it not only easier but also worse.

I would scrap all mention of Proficiency bonus in the summon and any time you say level, make sure it's sorcerer level.  What you have makes a 1 level dip outrageously strong.  Base everything off sorcerer level somehow. 

All very good points. 

1) Do you think the companion should have a different stat block? This is essentially the Steel Defender, but previous posts said it should be something like the Drake Warden's companion.

2) What kind of bonus actions and reactions should it be? I'm thinking about the way Wildfire Spirits work.