Thanks for the suggestion, I agree that is a very sensible breakdown of the levels. So this would result in zero 3rd level spell slots, -1 sneak attack die, but gain feats or ability points. Trade-offs, but it could work depending on what you choose to do with those ASIs. In both cases the...
If your play goes into the higher levels, it might be fun to experiment with Darkness (with Devil's Sight) + War Magic (from Eldritch Knight) + Sneak Attacks (from Rogue of course). This combo would let you cast Eldritch Blast (pumped with Agonizing Blast) and attack with your weapon (as a...
It's not just the spells themselves, but sometimes the combinations...
Glibness & Telekinesis (by charisma-based spellcaster):
Both from previous editions. The mechanics enable a beautiful synergy by RAW. Glibness lasts 1 hour (no concentration) and sets the minimum possible die roll for any...
A dangerous ranged combatant, combining Eldritch Blasts and a ranged sneak attack each round, attacking from Darkness with advantage on attacks, and bestowing disadvantage on incoming attacks. I give you, the Arcane Eldritch Trickster Knight!
Half-Elf
Str 10
Dex 13 (14 with +1 from Half-Elf)...