I promised a video of my base and how it's progressing so I start with that and then enter the nether to show my work so far on an xp/blaze farm I'm setting up.
XP from blazes is listed as 10 per kill on the wiki which is more than any other mob bar dragons so I decided to test it out and it's looking good so far. Cave spiders are decent XP and easier to deal with though so I may make one of those also at some point.
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https://www.youtube.com/watch?v=JJ8WlC4aC8c