"Honour is a dirty word" - graffiti written in blood and oil on the broken doors of Fort Sezarris
It is easy to fall into the trap of thinking the Hollow Knights are mindless, or driven only by their hunger. In truth, they are every bit as cunning and capable as any other Chaos Space Marine, able to lay plans and ambushes to deadly effect, allowing them to break through an enemy line and feast on their foes. Even in sieges the Hollow Knights are far from helpless, firing corrupted munitions at enemy bastions or enacting rituals of decay to wither enemy fortifications. For truly implacable defences, there is always one final ritual: the cursed rite that unleashes the Hunger Plague.
Those afflicted are driven with the same nightmarish need to consume the flesh of the living that plagues the Hollow Knights themselves. Though, in a cruel twist, those blighted with the ritual are seldom granted the regenerative abilities the Knights have. This ritual is, however, seldom used by the Hollow Knights. Not only does it takes time to enact, use of the ritual deprives the Hollow Knights themselves of a potential food source by forcing the defenders to consume each other.
On the occasions that it is invoked, the Hunger Plague is used to weaken or disable key parts of an enemy's defences, allowing the Hollow Knights to break in and sate their terrible hunger. In open battle the Knights are relentless and reckless, rushing forward with a startling suddenness not normally associated with servants of the Plague God. They hurl themselves at their victims with wild abandon, knowing that when they feast on the slain they can recover from almost any wound.
Here's some more plague lads for the plague party.
I've got a few more left, but honestly don't know when my next day off will be, so they might be some time in the making.
There's a couple of extra shots in the spoiler tags below: