

Possibly a weakness is the only dedicated transport available is a land raider. Hence they need to look out for AP1 weapons from things like vindicators (as well as certain Mechanicum units in general). They share a lot of the same features as terminators. As well, they are chosen warriors and able to be taken as command squads as well (in which case they swap out their shield for a legion standard). The bonus to Ld for units within 12" due to Lords of Ultramar is fantastic. In addition, their armour is 2+ which makes them the equivalent of terminators in terms of raw armour save. Continuing the terminator analogy further, these guys are simply better due to not being bulky, having grenades, boarding shields, and being able to sweep enemies. This is very powerful considering that most other AP2 weapons go at I=1 in melee (e.g., terminators with power axes). These space marines not only have an extra pip in WS, but all are armed with Legatine Axes - that means an AP2 weapon going at initiative with a chance to automatically wound on a natural roll of a 6. They are selected for greatness, and in effect this warrior cadre is for those marines who are in command training to a greater or lesser extent. In effect, they are Guilliman's chosen: selected for special roles and armed appropriately. The Invictarus Suzerains serve Guilliman in a direct manner, rather than going through the usual chain of command that the Ultramarines Legion is known for.
