A-okay to give centaurs true speech and some basic things?
By true speech do you mean some form of language like common tongue? I was thinking that the way they communicate at the present time is more like clairsentience and empathy rather than actual speaking although if you want I could change it.
I can throw in spears probably since I doubt armour, knives or bows have been invented yet...
It might take me a post or two to get around to it, but I have a lot of prestige on my heroes to work with. What direction did you want to take the centaurs? Was there any specific inspiration that you had in mind for their eventual culture?
I was thinking of having this first centaur be more of a neutral force than one set with a goal. It'll probably expand to a culture surrounding survival and nurture rather than any of conquest or power. I was however hoping that they could perhaps integrate or learn off of other cultures or species - for example learning of bowyery and archery or perhaps farming could be learned from others when they develop or on a simpler term centaurs could join other civilisations or orders rather than create their own. Above all of this, the first Centaur (who we will name Dave for context) has a mission of ensuring the prosperity of the seed, though that does not mean he must stay with the growing seed he will return if he is unsure of it's safety.
