I keep thinking about Saurus Warriors, as I am wont to do. Especially now that I've played a game with them in 3.0. And thinking about Saurus Warriors makes me think about the role they at least want to play.
Now that skinks are stuck at a 6+ save with +1 from shields, Saurus Warriors are really the closest thing we have to an anvil within our faction. Which is not saying much, but it's something we have to think about.
Guard can't be our defensive piece, they have a job to do and are honestly meant to die. Knights can't be a defensive piece, that's a waste of their abilities. Skinks can't be a defensive piece, their saves are far too weak now. Dinosaurs can't usually block and also can't hold objectives alone against even a couple of units, so they can't do it.
Are Saurus Warriors the best "Hold the Line" unit we have available to us for the points? Maybe and maybe not. I have a few thoughts that may or may not be worth a damn, ultimately.
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While Saurus Warriors may be the best "anvil" in our faction, we now have several options beyond our faction. The question is figuring out which one is best for the points. I'm only going to look at defensive capabilities.
Saurus (105p for 10): A 4+ save is alright, since we have easy ways now to make them 3+ and ignoring rend 1 or even 2. I think they're super underwhelming in Starborne now. Maybe not bad in Coalesced. Scaly Skin could go a long way if we're entering a hero/monster meta, as they almost all do multi-damage attacks.
Dreadspears (90p for 10): Barring Scaly Skin, basically equally as tough as Saurus for a hell of a lot cheaper.
Freeguild Guard (85p for 10): Save doesn't get better than 4+, but rerolls 1s. Super cheap though, and that matters.
Liberators (95p for 5): Starting at a 4+ save rerolling 1s instead of ending there. Definitely tougher than Saurus Warriors for the points, but fewer models to hold objectives with.
Sequitors (130p for 5): 4+ save rerolling everything is awesome. Especially with mystic shield and/or All Out Defense. A bit pricy and still only 5 models though. Dunno how to measure their toughness for the points compared to other stuff.
Eternal Guard (125 for 10): 4+ save on 10 models. And just for standing still in a turn they get +1 to hit, wound, and save. Which means every opponent turn unless you Redeploy them. Stacking mystic shield and all out defense would make them ignore a lot of rend, too. I kinda like these.
Phoenix Guard (175 for 10): 4+ save on 10 models. 4+++ Ward. The classic CoS anvil piece. Super tough, obviously. But that is an eye-watering price, in my opinion.
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I think it matters to look at this, because I get the sense if we don't have any defensive pieces in our armies going forward, we're going to get run over on these smaller tables and our objectives will just be stolen from underneath us. Anvil Skinks were great, but they are dead, and we have to deal with that.
My not-so-hot take is that Saurus Warriors are ab-so-lute garbage in Starborne armies. Any ally unit from this list would be better. Maybe they work just as an emergency summon, at least they'll hold better than skinks.
My lukewarm take is that Saurus Warriors could still have a place in Coalesced armies if we are truly entering a hero/monster meta because of Scaly Skin. And, hey, it seems well possible.
My warm (hot?) take is that in all other scenarios, Dreadspears or Eternal Guard (and maaaybe Sequitors depending on whether or not they change in the upcoming SCE book) are the probably the best anvils we can take, depending on whether you value the bonuses Eternal Guard get or not.