Hackbut has the four classic classes. I did not spend a lot of time debating this. OD&D has cleric, fighter and magic-user. Greyhawk added the thief, and after that, came the rest. But those four cover the spectrum one needs in a classic medieval fantasy game.
I have a conflicted relationship with the cleric. In my homebrew setting I lean towards sword and sorcery, and so demon-hunting clergy are a bit of an ill fit. But it was clear from the get-go that I needed clerics in there for compatibility with the assumed rule set for Castle Xyntillan. And upon reflection, now that we are (at the time of writing) over 15 sessions in, the classic D&D cleric can be a lot of fun if the setting leans into its pseudo-catholic nature. So yeah, the cleric stays. Four classes it is.
As I’ve previously mentioned, the chassis for the Hackbut classes are taken from the Hungarian retroclone Kazamaták és Kompániák (KéK). Ynes Midgard translated them into English on his blog. When I saw those I felt like I had the kernel in my hands for the D&D hack that I wished for. Really the main thing about them is that the progression goes up to level six. I like a low-powered game, so seeing an example of how it could be achieved in a classic D&D framework was inspiring.
I changed a few things about the classes of course, as a home brewer is prone to do. I previously talked about saving throws, how I swapped those out for the unified save from Swords & Wizardry. One more thing I changed since posting about that is to express that unified saving throw as a “base save bonus” that gets added to a d20 roll against a fixed target number of 15. Players continuously struggled with the original save mechanic. This appears to be more intuitive for them because it resembles the target 20 attack roll mechanic we use.
Then there were a few less significant changes. I massaged the XP values on the thief a tiny bit. It bothered me those did not start at 1.250 and progressed from there. An insignificant change, but I’m just particular like that.
Another tweak I made was to the weapons allowed for the thief and the magic-user. Again, mostly just small changes because of personal preference. The thief is allowed leather armor only (no shields); hand axe, club, dagger, spear, staff, short sword, short bow, light crossbow and sling. The magic-user is allowed no armor at all; and clubs, daggers and staves.
I made further changes to the specific abilities of each class, but I will save discussing those for future posts. I’ll just close by saying that those KéK classes have served me well as a base for my game, and I recommend checking them out.