...but who knows what might awaken in the depths of Vulcanus.
I don't know but i get strong diablo 2 act 4 hellforge vibes

so i would say fiery enemy, but the sulfuric acid is also a possibility for the wildlife to weaponize its environment. In any case, to be able to develop on this rough land the flora and fauna must be very resistant to things we used to kill them usually, i wouldn't be surprise if flame turret are of limited use against the natives of Vulcanus.
Most of the things felt while reading where positive and it's long to write it all so i'm going to start by the negative : it's very unrealistic to drive a tank this way, most of the time you run into a cliff or something, and with the new rocks and chimneys and craters , it's hard/will take time to know what collide or not, which would yield a totally different driving style.
About the positives, i feel like this is really "space age" feeling, it's not nauvis 2 it make sense that there would be planet colder or hotter, this is a hotter planet, it is visually instantly clear, even without lava directly visible. I like the attempt at doing "biome" such as ashland, mountain and lava basin, that are very different unlike desert and grass we have currently,in that there is a possibility to attach ressources or landscape features to such biomes .I found this a very good news that can be exploited in a lot of ways. Those shown are interesting, it make sense to have a place where it's easier to build also mountain vs basin make sense in a moutainous landscape rather than "hot/hotter" , it gives incentives to do some exploration and also to plan around the geography a bit more than landfill + concrete everything.
I saw no water, which would be an interesting challenge regarding the means of producing energy we have, i expect the future structure we will be told about will be something to deal with that, harnessing the thermal energy of the planet so as to produce electricity without water but i can't remember if that was teased before or if it's just my imagination.
I like the trick of the fake shadow for the cliffs, i grew up playing games using this like Age of empire 2 or the old command and conquer (and their remaster version), even starcraft 1, i think it could be made even more visible what is supposed to be of higher elevevation with an even bigger shadow or something i don't know, somehow the craters are more readable, i really like the craters

Maybe the lava pool outside border could be a little less flat too, the rocks outside a bit more jagged like the lava had flown in the pool carving little path and some rocks cracked poiting up to make it look like even if the laval level is flat some part are higher up above the pool that has more depth rather than all lava lake are filled to brim. ( after some though i think i have most trouble with the horizontal cliff when the north part is "lower elevation" and the southern is "upper elevation". i'm more used to "miss" a piece of the " nothern part that is hidden by the cliff rather than seeing a fake shadow north of the horizontal cliffs, maybe it comes from being used to isometric perspective hence why i prefer the craters).
I like the idea that you can void item into lava, because it's realistic as far as i know and it will help a lot to simplify interplanetary logistic if you can extract Copper AND iron from lava without choosing, and then you have to deal with the byproduct. It adds a the void-mechanism similar to space platform throwing into space, but that make sense on a planet, it's i suppose good for gameplay and well integrated

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There was no footage of engineer shown walking on the surface of the planet, i expect this has to do with the atmosphere, maybe pressure or composition ? Something that requires staying inside a tank maybe equipped with special equipment ? I mean it doesn't look safe to walk too close to those yellow clouds , i know it hurts lungs to inhale smoke and i wouldn't want to try steping in the acid.
I like the idea that you get "sulfuric acid", it's an "advanced product" which was already present in vanilla, so getting a new way to get it that is as a "raw material" i think is going in the direction of " when you progress in technology you get fast means to get things that used to require more footprint to get", it's like getting a faster vehicule for a longer trip so the overall time is the same but you are allowed to go further.
I get the same feeling from calcite , knowing that it's meant to be used in conjunction with other product and it not being a raw material on its own meaning having its own set of refined product made only from it. That's how i understood it, it's like a boost to your exisisting production, once you have access to it. I think from gameplay perspective it's very good that not everything new is to be used for "new" product. Curious to see where Tungsten lies there. Maybe you can replace iron in some product if you want higher quality ? and otherwise it's just replacing iron with a high ratio because tungsten is much more resistant than steel ?
These fiery crucibles offer a great place to get rid of waste items; just throw them in and poof, they're gone in a glorious puff of smoke and flame. Outdated gadgets, cursed rings of power, maybe even unwanted company.
So you could imagine a player driving an elevated train above some lava river and then you would remove the pillars and it would be stuck ? Could you make it fall ? Was that supposed to mean something to trap biters ?
The more important questions remains unanwsered : can we move lava around to create lava trap back in Nauvis ? Is tungsten barrel a thing ? is lava too hot ?
Also can you cook fish with lava ?
Does it create a little cloud if you try to void a water barrel ?
Can you use offshore pump with lava with maybe tungsten pipes and use it as fuel for flame turret ?
I feel some more FFF are welcome to clarify everything

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