HoMM VII Haven Units – Haven faction units from the seventh installment of Heroes of Might and Magic.

What exactly makes it more difficult to obtain the "Guard" models than the "Sentinel" models?

There are a lot of obstacles left by the developers of Heroes 6, in the form of illogical skeletons with a bunch of useless bones and mirroring along the XY axes, and there is also a lack of desire and time to deal with this, at least for free...