There is no rule that fine piles of dust are dead.
Especially if you consider the possibility of non-water-based life evolving at any point in time with any material. If the only requirement for life to evolve is that there be an energy density gradient to power a temporary local decrease in entropy over any time scale, then life could have evolved as early as 10^-32 seconds after the Big Bang; sure, life would consist of creatures made of some sort of quark-gluon plasma, but I’m having fun imagining some necromancer from that time downloading themselves into a new body compatible with the latest changes to environmental conditions repeatedly for billions of years. If many such necromancers arose independently at any point in the past, then the waste products of them or their minions might comprise a significant fraction of the entire observable universe with their “fine dust” corpses / waste products.
Therefore, it may be a productive activity to attempt to resurrect dust (or equivalents) collected at different spatial scales (e.g. dust collected from a planet’s atmosphere, interstellar dust) and modulating the temperature and rate of time of the resurrectee’s environment container so communication could be established. Collect atmospheric dust from a planet and you might resurrect an ant or a tree. Collect interstellar dust from around the solar system and you might resurrect a titan. Collect photons from a past-viewer opened to a time before dust clouds absorbed most bosons emitted from previous eras and you might resurrect a quark-gluon cow or something.
To resurrect something you could have a conversation with, you might need to need to curry favor with a necromancer who has been downloading themselves into new bodies for billions of years. You could use the earlier-mentioned past-viewing magic to look into their past (specifically, the regions of space around their past selves), then you could identify the spatial position of one of their long-dead loved ones, see which cosmic dust cloud or collection of photons their bodies turned into, collect said partial remains, and then resurrect said loved one. You run the highly probable risk of their loved one being horrified at being revived into a cosmos inhospitably cold and dead compared to what they remember, but if you can use the necromancer’s techniques to download their mind into a body compatible with current physical conditions, then you might be forgiven.