Time to enjoy the Winter Triad of Pets from the comfort of early spring. Follow these steps to redeem your 3 new friends!
[tl;dr: the pet code for a network of roots is PF4430323, the pet code for Frillicent is PBRQ3I49U, and the pet code for Goshling is PON5EIBB7.
1. Make sure you're on one of the latter versions of Qud [anything after v201.86 (mainline) or v202.46 (beta), or the new alpha branch].
2. From the main menu screen, select Redeem Code.
3. Download and install the pet mods by entering the codes:
PF4430323 for a network of roots
PBRQ3I49U for Frillicent
PON5EIBB7 for Goshling
4. Create a character. Before you start the game from the character confirmation screen, select Choose a pet.
5. Choose a network of roots, Frillicent, or Goshling.
Enjoy, friends. Live and drink.