Arcane Trickster

Arcane Trickster is a Rogue subclass from the PHB. It functions as printed, except as noted below.

Spellcasting

Eldritch Knights are not "one-third casters" but rather half-casters. See the Classes page re the removal of "one-third" casting.

Your spells must be chosen from the Bard or Warlock list, and do not have a restriction on spell school.
At 4th, 8th, 12th, 16th, and 20th level, you learn an additional spell known on top of the spells known from your half-caster table, and these specific spells may be any spell from the Wizard spell list.
You start with two bard or warlock cantrips, and gain a third cantrip at 10th level which can be from the Wizard list.