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{{Unreferenced|2=[[User:Desmond Hoo|Desmond Hoo]] 16:46, September 1, 2009 (UTC)Tsrwotc}} 

The phlogiston is that which is outside and between [[crystal shells]]. It appears as an infinite fog of swirling colors.<ref name="SJAS">{{Cite_Pub|AD&D Adventures in Space}} ''Concordance of Arcane Space''. pp. 10-11.</ref>

The Flow's vastness is dominated by [[flowriver]]s, which link crystal shells in a mind-bogglingly gigantic 3-D web. Flowrivers are useful to spacefarers because they (greatly) facilitate travel between the crystal shells. In many cases, a journey directly to a specific crystal shell would take many years, but the journey can easily be shortened to a much smaller amount of time by following the flowrivers from one shell to the next. (Hence, navigation in the phlogiston is a tricky connect-the-dots activity).<ref name="SJAS"/>

It is not possible to see a flowriver (though detailed measurements can detect a significant increase in the drift of the multi-colored fog in one or two directions). They are felt more than seen; an individual sitting on a spelljammer helm can easily realize that a starship has entered a flowriver.<ref name="SJAS"/>

Most flowrivers are two-way, allowing passage in either direction between two crystal shells. However, some are one-way, so it is not advisable to try to double back along a one-way flowriver (doing so poses the same difficulties as not using a flowriver at all).<ref name="SJAS"/>

The Manual of the Planes would have probably termed the phlogiston as a Transitive Plane had it been included in that volume, and in many ways, that's exactly what the Rainbow Ocean is. (It is still considered a part of the [[Material Plane]], however, as are all known crystal shells). Nevertheless, there are features within the rainbow fog and even occasional [[phlogiston inhabitants]].{{fact}}

The Flow is softly luminous, so light sources are not necessary on a ship's open decks while in the phlogiston. <ref name="SJAS"/> Visibility is quite limited, however - treat the phlogiston as heavy fog for that purpose.{{fact}}

Most places within the phlogiston look exactly alike, but there are known, and dreaded, [[Dark Regions]] from which few have returned. A feature unique to the Rainbow Ocean is the strange [[flow beacon]], an object that resembles a rapidly spinning star. No one has ever determined who built these devices, nor what they do.<ref name="SJAS"/>

The phlogiston is extremely flammable within any kind of air, so the use of fire is highly inadvisable in the Flow. Even a spark can set off a small, fiery explosion. <ref name="SJAS"/> If a spell is cast that produces flame, it goes off instantly, centered on the caster, <ref name="SJAS"/> and it is considered to be cast as if on a plane with the [[minor fire-dominant]] trait.{{fact}}