Individual Class Levels
Eldritch Knight Fighter:
Arcane Trickster Rogue:
The Warlock class provides the Pact Magic feature, not the Spellcasting feature. Spell slots provided by Pact Magic coexist next to spell slots provided by Spellcasting, and don’t need a multiclassing calculation.
What’s Up With Artificer?
Tasha’s Cauldron of Everything says you add half of your Artificer levels, rounded up, not down.
You can find the source here: https://github.com/thebombzen/thebombzen.com/blob/main/orange-slots/
Contact me on Discord, or open a bug report on github. My Discord username is thebombzen#3287. You can open a bug report here: https://github.com/thebombzen/thebombzen.com/issues.