This is a great adventure for new players! Just ran this for my wife, sister in law, parents, and 78 year old grandmother as an introduction to D&D a couple nights ago. It was so good and fun that they've all asked to continue the game tomorrow night and include my mother in law and other family!

Now I just need to put together the next chapter in the adventure for 6+ players... Maybe FroJack will have to make an appearance.

I'm going to start by saying that I absolutely love this class and have been excited to start playing as a rock gnome industrialist in my weekly homebrew game ever since we got to the final weeks of our recently completed Ravenloft campaign. Since we started at 3rd level and you've made several changes to the early level progression based on Tom's review, I haven't experienced any of the issues that he did so kudos on your quick response to that feedback (other than only getting two skills instead of the four I would expect).

Other than a few typos here and there (e.g., the starting equipment has "leather" as an item and a non-existent pack as an option), the PDF is well put together and nicely structured. That said, I do have a few questions about some of the design decisions for the class which will help my DM and I to nail down the mechanics of this class as we progress our campaign through to level 20. Sorry in advance for how long the rest of this review is, but I figured I'd put it here so that others who want to use the class can see your responses:

1. Is there a reason that the Industrialist is proficient in Constitution saving throws instead of Dexterity saving throws? Jumping out of the way of an explosion seems more intelligent than just taking it. I know this is mitigated a bit by the Quick Thinking ability once you hit 5th level, but I've just been a little confused by the Constitution proficiency while building the character.

2. It makes sense that if the power charge has been used to overcharge an invention that it will need a long rest before it is usable again (overheated, needs repair, etc.). However, I'm wondering about something like the extending ladder: if you only want to put the charge in for 2 minutes while you and your party climb the ladder then you remove the charge to shrink the ladder back to its 1' unpowered length, it seems counter-intuitive that the charge would then be unusable until the next day. This is less of an issue after you get the Power Refill ability at 3rd level, but still a little confusing for the inventions you might want to power on and off regularly. Maybe adding text for these types of items to say you can "activate/deactivate" it while it's powered without pulling out the power charge would help?

3. Journeyman: To bring this more in line with other similar abilities (like a Bard's Jack of all Trades), I think it would make more sense to add half your proficiency bonus rounded down to tool checks instead of half your Intelligence modifier rounded down. As it is, with a decent starting intelligence (18+) there is no difference between being proficient or not with any tools for the first 4 levels, and only a difference of +1 for the next 4 levels.

4. Knowledge Sponge: How many different skills can you use this ability with on a given day? Assuming there are 3 short rests in a day, could you potentially (temporarily) learn 3 different skills?

5. Insane Inventor feat: I assume this feat was written before the level 14 increase in Power Surge dice was added to the main class. Should this feat be adding +1d6 to the Power Surge instead of just setting the additional damage to 3d6 (i.e., a total of 3d6 before level 14, and a total of 4d6 after level 14)?

Finally, I would love to get your opinion on two things:

• What do you think of the possibility of adding Industrialist feats that allow followers of another Industrial Vision to gain the level 6 abilities of the Futurist or War Tinker visions (i.e., Capable Tutor and Powerful Charges). Would this be too powerful and/or unbalanced? Maybe with the requirement of having the ability to craft inventions from that vision (e.g., by taking the Creative Mix feat first)?

• What kind of tradeoff do you think might work for exchanging time for gold when crafting inventions? In a low-gold, high-downtime campaign I would expect that spending a lot of time finding parts/materials/supplies/discounts should reduce the cost of building an invention. This shouldn't be too high a ratio, but enough that spending a month on something should result in a significant reduction in cost. Thoughts?