So Matt said that it would take about a month of downtime for Grog to learn how to read/write like a kindergartner, yeah?
So imagine after the Conclave falls, they finally get some rest. They pop between Whitestone and Emon, spending a week or so in each city before returning to their other home.
A primary school has been established in Emon, and one day Grog is walking along on his way to one of the dozens of construction sites. He passes by the school, and sees a little boy crying while walking home. He asks the kid what’s wrong and the kid says he was being bullied by the bigger boys for not wanting to kick a cat that passed through the playground that day.
Grog of course flashes back to being kicked out of the herd for not wanting to kill Wilhand, so he tells the kid to describe the ones bullying him. The next day, he rolls into the playground in his finest badassery and finds the bullies. He gathers all the kids around - some of the teachers are concerned but the head teacher recognizes Grog and lets it happen - and makes the bullies stand in the middle.
The bullies are of course scared shitless, and the kid is worried about what he just started, but Grog doesn’t do anything. Instead, he gives a long lecture about mercy. He tells them about how, after all the hurt of the dragons, the most important thing is to be kind to one another and help each other up. He tells them not to emulate the dragons, but to emulate Lady Cassandra of Whitestone, who took in refugees when her own city was hurting, or Kerr the Blacksmith, who rose up to lead a community of peace, or Wilhand the Gnome, who all but adopted a young man he logically should have feared. He tells them that life needs things to live, and that those things are brotherhood and kindness.
The bullies are suitably shamed, and after the lecture Grog lets the kids rope him in to playing with them. At some point, the Grog gets to talking with the teachers, and somehow ends up revealing that he doesn’t know how to read. “What with all the adventuring and world-saving, didn’t have much time to keep up with my studies,” he explains.
And that’s how, much to everyone’s amusement, Grog comes in the next day as the very biggest new student in the classroom, and learns how to read along with his new lil buddies.