Is there any reason for the naming of the wards in Reborn the way they are? Lapis, Obsidia etc. I think I read somewhere that there's a reason but I get confused with the naming reason of moltres, articuno, zapdos(uno, dos, tres) so I'm kinda lost.
Yeah, gemstones, with quite a few birthstones actually. If you look at the names of birthstones quite a few are used in Reborn in some way. Opal, Citrine, Tanzan, Sapphire, Tourmaline, Peridot, Spinel...
