Well, I think that the single phalanxes cannot be parried as well, at least i've tried all the timing combinations and the blow just sticks. Also, are there enemies that can't even be blocked normally, like the Vanguard that kills you at the Tutorial?
I have tons of Soldier Lotus, those halberd/spear lotus always seem to drop one or two.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"