2 things for me... Botania rulez, and I love the rune altar. the ingredients make sense, the mechanics are awesome and I love the four elements & four seasons collection. love the way the whole thing comes alive after u put in the right items. whoosh!!
I also love the Ars Nouveau tools. the enchanters shield is awesome, but also honest: if ur in the nether the piglins recognize it as gold stuff, so they dont attack u.