Your Garrison cache is great for upgrading buildings a little at a time but you can't be in any kind of a hurry to do it because you only get so much a day and some of the quests don't work so you can't get many of the garrison resources from questing. Now, to upgrade it will cost you a minimum of 2000 garrison resources to upgrade to tier 3 and I'm not sure how to get the shipyard going because the quest doesn't work. The problem is farming for garrison resources is next to impossible because the bosses are so jacked up, you can't defeat them on your own. While trying to beat several bosses - 1 at a time of course, I used me, my void-walker, the infernal guardian AND the Call to Arms all at once and you still can't defeat the bosses and there is no orge cache's in the auction or any to be found, that I know of anyway. They're not in the shop so how can someone farm resources SOLO within a reasonable amount of time? I've went through so many YouTube videos and wow-head page topics and that's when I found out how jacked up the bosses really are, when I went to defeat them. Thanks for reading and if anyone's had any luck, please let me know.