Now if we really want to be technical there is no such thing as "magical" or "physical" or anything else for that matter. It's just a bit flag on the WS inside the games database. The bit flag is checked during the attack script that the appropriate code is called to determine what actually happens. The whole physical / magical damage types and subtypes is just us trying to figure out what exactly SE is doing inside the games database on the server. SE could of named one of the bits carrot and anything with it set to 1 would be calculated as doing carrot damage. The attack script upon detecting the bit flag of carrot set to high would then call the carrot damage formula and check to see what value was in the targets carrot damage resistance entry.

So all this nonsense of "spirit" and other crap is nothing but a set of bits on an entry in the database.

Nevertheless, the WS Req deals physical damage but isn't Piercing, Blunt, H2H nor Slashing damage. PDT will reduce it but none of the three known physical damage resistance's will effect it. Basically Physical Shield will reduce Req damage. Spirits / Atonement both are not effected by PDT nor any of the three known physical resistances (Slashing / Blunt / Piercing). Magic Shield will reduce the damage from Spirits / Atonement, but no other elemental resistances will effect them (Fire / Darkness / Light / ect..).

Based on the above information we can conclude that Req is Physical damage with no other bit flag set (Slashing / Piercing / Blunt / H2H).