I don't think I'm alone in feeling that Intelligence is too much of a dump stat in 5e. In 3e, Intelligence granted bonus skill points and languages known, but that was dropped for 5. I understand why they did that, but I'm not happy that no other mechanics took their place (at least beyond skills and saving throws, and even then INT is probably the least valuable in that regard, too).
I have an idea that I think will fix that (at least somewhat), using the Training function of the Downtime rules. Basically, the 250 days required to learn a new language or tool proficiency would be reduced (or even increased) by 25 days per point of Intelligence above (or below) 10, to a minimum of 1 day at INT 20. Now, the utility of this is obviously dependent on the DM even using the Downtime rules to begin with, and the ability to learn a few extra languages and tool proficiencies still doesn't quite stack up to bonus hit points or modifying both AC & Initiative, but I think it's at least competitive with improving your carrying capacity.
Anyway, thoughts?
The breakdown, by INT Score:
INT - DAYS
8 - 300
9 - 275
10 - 250
11 - 225
12 - 200
13 - 175
14 - 150
15 - 125
16 - 100
17 - 75
18 - 50
19 - 25
20 - 1
I have an idea that I think will fix that (at least somewhat), using the Training function of the Downtime rules. Basically, the 250 days required to learn a new language or tool proficiency would be reduced (or even increased) by 25 days per point of Intelligence above (or below) 10, to a minimum of 1 day at INT 20. Now, the utility of this is obviously dependent on the DM even using the Downtime rules to begin with, and the ability to learn a few extra languages and tool proficiencies still doesn't quite stack up to bonus hit points or modifying both AC & Initiative, but I think it's at least competitive with improving your carrying capacity.

Anyway, thoughts?
The breakdown, by INT Score:
INT - DAYS
8 - 300
9 - 275
10 - 250
11 - 225
12 - 200
13 - 175
14 - 150
15 - 125
16 - 100
17 - 75
18 - 50
19 - 25
20 - 1