The Mindless Dead are a category of undead that refer to the more simpler forms of undead. These creatures do not have a truly functioning mind and instead act entirely upon instinct or by the command of a Necromancer. They shamble about in the clothes, armor, and tools they once held in life but truly they are former shells of what they used to be. These undead are not capable of complex thought, but instead act upon instinct. This is why a skeletal knight is able to fight with a blade much like how he did so in life; these skills carry over as instinct. There are a few varieties of Mindless Dead that vary in power. It should be noted that one should be wary to approach such beasts without being properly prepared.
Zombies
The Zombie is perhaps the simplest form of undead. Flesh continues to cling onto them even in animation. An interesting point to note is that the Zombie's movement is slow and ragged. I can only conclude that the reason this happens is because the body as a whole is not animated by rather the skeletal remains. The Skeleton of the creature is then weighed down and contorted by remaining flesh. Zombies are constantly decaying and rotting despite their animation. As far as undead go they are in incredibly rough shape. The Zombie is incapable of speech and instead let's out groans and moans of dulled pain.
Skeletons
The skeleton could be seen as the 'upgrade' to the zombie. Their movements are more fluid and they can walk and run at a normal pace. They wield weapons and they can more often than not be proficient with them if they were proficient in life. They still cannot speak however. Their skeletal form allows them to be far more resilient to a plethora of attacks as well.
Huecuva
The Huecuva are a form of skeleton that I believe is worth mentioning on its very own. These undead are the remains of priests who had perished. It is said they were priests who did not truly follow their vows and then rose again as these demented skeletal forms. They wield arcane magic and can very easily be the most dangerous of the three mentioned here; unless a skeletal warrior is so impressively trained.
RECOMMENDED WEAPONS
BLUDGEONS ~ The best way to deal with bones is simply to break them. Cutting weapons are not the best when faced up against bone, and arrows and bullets will have their difficulties. A simple and straight forward solution to a very terrifying problem. My personal recommendation would be a Maul or a Morningstar. The Maul being an incredible bone breaker while the morning star can be held in one hand allowed the other to be free to use a shield or grab another important object.
THE DIVINE ~ I have seen powerful and faithful priests send the mindless dead into a cowardly hysteria. As they hold aloft their righteous symbols and call out the name of their patron. The dead tremble, mindless and intelligent a like. The dead cower in the face of the divine for their very existence is an affront to Ezra who would guide and protect the deceased rather than allowing them to become wicked monstrosities. While a bludgeon of some sort is ultimately the most practical tool. If you are aware that you may face the dead or mindless dead then it would be best to find an priest or priestess and make an offering to recruit their support.
PLATINUM ~ While this suggestion is expensive and impractical it is certainly worth mentioning for the hunter with excellent finances that platinum seems to have an adverse effect against the living dead. Armor gilded with the material will keep the dead away and weapons gilded will curiously find themselves able to cut or break through the deads natural defenses much more efficently.
THE NECROMANCERIt would be utterly worthless to address merely the puppets and not the puppet masters. As an arcane school Necromancy can have it's practical applications that can be useful in combatting monsters and even the undead themselves. A perfect example of this would be the spell 'Undeath to Death'. That being said though, there are those who focus their time on the practice of the black arts. Many spells within the school are dark and depraved and allow the wielder to animate the dead for their own selfish purposes as opposed to respecting the past life once held. Necromancers can wield either Arcane or Divine magic.
RECOMMENDED WEAPONS
FIREARMS ~ It goes without saying that a ranged weapon is the preferred tool against an necromancer witch. This is purely a matter of logistics. Witches use their spells, and spell casting is conducted through verbal and somatic components. For those who aren't quite so learned on the arts both arcane and divine, what this means is a witch has to say a few 'funny words' and conduct 'silly hand gestures' to materialize their spells. Doing this does not require a tremendous amount of effort, and can be done relatively quickly. Logically, that would mean to walk or run up to one of these witches and swing a weapon is usually impractical. A ranged weapon however will eliminate the problem of 'closing the distance' and a fast hand will promise a necessary strike before they can complete some of their more vital spells. Firearms are listed first because of their practicality and ability to bypass armor. While many witches are not armored, those necromancers who have aligned themselves with fiends and legion may act as high priest cultists and can wear armor. The firearm bypasses armor, and already strikes unarmored targets well. Further more, the devastating blow caused by a bullet is more likely to disrupt a witches incantations than more traditional ranged weaponry. These defilers of the dead tend to be frail and not physically healthy as they spend a great deal of their time reading books and studying advanced incantations. The goal should be to slay them outright, or hit them fast enough so they cannot call upon wicked magics. It should be important to note that it would be unwise to strike a prepared witch, and if one is expecting to engage one it is important to never do so on their terms.
TRADITIONAL RANGED WEAPONRY ~ Traditional ranged weaponry is fast moving with an overall quicker reload than even firearms and certainly crossbows. These weapons at times can also be more devastating especially when striking a weak point. Many of these necromancers end up seeking the boons of undeath for themselves whether it is the path of the lich or perhaps other grisly paths. It is because of this path walked, that the most advanced of necromancers may not have any natural weak points. Traditional ranged weaponry is fine against the witch, but make sure ammunition is powerful and it is highly recommended it is enhanced alchemically as well as coated in burning alchemical varnish.
CROSSBOWS ~ The crossbow is slower than more traditional ranged weapons, but can be somewhat faster than a firearm. Though the damage of a firearm is far more devastating and its ability to punch through armor simply outclasses crossbows entirely. It is however good to keep a ranged sidearm at all times, and I personally would rather have the crossbow than have nothing at all should I to be faced against the necromancer witch.
CLOSING THOUGHTS
The problem of undeath can occur for many reasons but I would say the core of the problem is witches who behave irresponsibly with the dark arts. My recommendation to preventing such incidents is to prevent the spread of Necromancy in the first place. As stated earlier, some of the spells can have practical use for eliminating the undead and monsters alike. There comes a problem however when practitioners start casually defiling someone else's remains for their own servitude. These forbidden and dark arts should be reserved only for responsible and well tempered arcanists who know not to use such arts for evil, and certainly ones that know better than to conduct the vile act of animating corpses. In a way The Mindless Dead, Necromancers, and Necromancy are a reflection of a much larger problem: mans inhumanity towards man.
Those who animated the dead don't care about the fallen's burial, their family, the life they lived, nor do they care to keep them at peace. Instead they would disturb their final rest conduct labor for their sickening masters. Mindless shambling about filling orders; spitting in the face of people the animator more often than not does not even know. It's important to oust necromancers, to uproot them, and execute them. Not only would you be ridding the core of a despicable evil, but you are also honoring the dead by freeing them from unconsented servitude.