This is a cool game, but it has a few problems. As others have noted, there is a typo in the corruption section, and it is missing info on what shields do. It’s also quite unbalanced.

Here are the problems I can see:

1 Dexterity is overpowered. It adds to ranged attack rolls, ranged damage rolls, stealth, lock picking, acrobatics, and defense. Compared with any other stat, this is simply amazing.

2 Constitution is weak. Since it doesn’t affect your hit points, it only gives a couple saves and bonuses to your carry weight, along with healing when you get bedrest. This is underwhelming, especially because healing potions made by the Plague Doctor are way better than bedrest.

3 Weapons are barely touched on, and lack sufficient development to even merit including in the first place. A little extra detail here would go a long way.

4 Shields are really good, if you use the rule that The Professor suggests of +2 defense. This is way better than the two handed options presented.

5 Finally, there are no spells included. That is ok, since you can use your imagination, but a few examples would be fun. Also, all spells have a DC of 10, which seems easy to me, especially if you put a lot of points into intelligence.

To fix the issues listed above, I have a few suggestions:

Dexterity adds to ranged attacks, ranged damage, stealth, lock picking, and acrobatics.

Constitution adds to defense and saves vs things like poison, disease, heat, and cold. Bed rest heals d6 hp, and constitution does not add to this roll.

Weapons: D2: Hand to hand combat D4: Dagger, club, whip, hatchet, light crossbow. D6: Shortbow (two hands only), rapier, staff. D8 (Requires strength 3): Longbow (two hands only), sword, battle-axe, spear, mace. D10 (Requires strength 3 and two hands): Greatsword, halberd. D12 (Requires strength 4 and two hands): Warhammer, heavy crossbow.

Shields add +1 Defense.

Spell casting rolls should have their dc determined by the dm according to the kind of spell being cast. Some spells should be harder than others, but stronger also.

Song of Blades and Heroes has an excellent premise and good basic mechanics. Unfortunately some parts of the rules are poorly worded so they are difficult to understand. For example, I didn't realize a defending miniature can knock down or kill its opponent when it is attacked on my first reading. The other frustrating part of the book is its constant references to supplements and other publications by the author. It tells you you can give a unit an ability like illusionist, tower shield, or music, but doesn't explain what those abilities do. This is annoying and makes the game feel unfinished.