I can think of a couple of non build ways to get that Wizards hit points down:

Level loss will sort out that Wizards hit points if the GM is vicious; if the Wizard was originally level 13 and had rolled 1 for every single levels hit points (13 total) then three level losses will drain 3d4 hit points, roll a 4 each time and they're down to 1 hit point.

Negative levels drain 5 hit points a time, so a couple of these could see the Wizard down to 1 hit point (if they had 11 to start with) they do however only last 24 hours and then it's level loss instead (depending on save).

A Bestow curse spell allows for some leeway: You may also invent your own curse Such a curse could be -9 to permanent hit point total until removed. This could also be from a cursed item of course.

If the wizard has a tendancy to cast spectral hand all the time then they're going to be d4 hit points down whenever the spell is cast; sadly this spell can't be made permanent that I can see.

I can think of a couple of non build ways to get that Wizards hit points down:

Level loss will sort out that Wizards hit points if the GM is vicious; if the Wizard was originally level 13 and had rolled 1 for every single levels hit points (13 total) then three level losses will drain 3d4 hit points, roll a 4 each time and they're down to 1 hit point.

Negative levels drain 5 hit points a time, so a couple of these could see the Wizard down to 1 hit point (if they had 11 to start with) they do however only last 24 hours and then it's level loss instead (depending on save). You can get quasi-permanant negative levels if the character is wielding a Sunblade, Nine lives stealer, Unholy, Holy, Anarchic or Axiomatic weapon (and are of the corresponding incorrect alignment)

A Bestow curse spell allows for some leeway: You may also invent your own curse Such a curse could be -9 to permanent hit point total until removed. This could also be from a cursed item of course.

If the wizard has a tendancy to cast spectral hand all the time then they're going to be d4 hit points down whenever the spell is cast; sadly this spell can't be made permanent that I can see.

I can think of a couple of non build ways to get that Wizards hit points down:

Level loss will sort out that Wizards hit points if the GM is vicious; if the Wizard was originally level 13 and had rolled 1 for every single levels hit points (13 total) then two level losses will drain 3d4 hit points, roll a 4 each time and they're down to 1 hit point.

Negative levels drain 5 hit points a time, so a couple of these could see the Wizard down to 1 hit point (if they had 11 to start with) they do however only last 24 hours and then it's level loss instead (depending on save).

A Bestow curse spell allows for some leeway: You may also invent your own curse Such a curse could be -9 to permanent hit point total until removed. This could also be from a cursed item of course.

If the wizard has a tendancy to cast spectral hand all the time then they're going to be d4 hit points down whenever the spell is cast; sadly this spell can't be made permanent that I can see.

I can think of a couple of non build ways to get that Wizards hit points down:

Level loss will sort out that Wizards hit points if the GM is vicious; if the Wizard was originally level 13 and had rolled 1 for every single levels hit points (13 total) then three level losses will drain 3d4 hit points, roll a 4 each time and they're down to 1 hit point.

Negative levels drain 5 hit points a time, so a couple of these could see the Wizard down to 1 hit point (if they had 11 to start with) they do however only last 24 hours and then it's level loss instead (depending on save).

A Bestow curse spell allows for some leeway: You may also invent your own curse Such a curse could be -9 to permanent hit point total until removed. This could also be from a cursed item of course.

If the wizard has a tendancy to cast spectral hand all the time then they're going to be d4 hit points down whenever the spell is cast; sadly this spell can't be made permanent that I can see.