Arcane Focus Longsword

This longsword counts as a two-handed arcane focus when held with both hands and a single arcane focus when using only one hand. The blade has an arcane focus implanted somewhere in the blade, other than the weapon's ability to be used as an Arcane Focus, the weapon acts like a normal longsword.

Two-Handed Arcane Focuses : If you use this optional rule, when a caster uses a two-handed arcane focus to cast an offensive cantrip (a cantrip requiring a saving throw or an attack roll), the range of the cantrip is increased by 50 percent. By this rule, a staff always requires two hands, while rods can be used with either one or two hands. Using a two-handed arcane focus fulfills the somatic component requirement for a spell.

The arcane focus can only be removed by a Smith, Jeweler, or an artificer with proficiency in Smith's and Jeweler's tools. (artificer's with the two proficiencies get advantage on removing the orbs)
(To remove the arcane focus(es) roll 1d100 (1-29 the arcane focus(es) are destroyed along with the sword and can't be repaired, 30-49 only the arcane focus(es) will be destroyed but the weapon is still repairable, 50-100 the arcane focus(es) are removed successfully and can be replaced easily.)

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bard, Cleric, Druid, Sorcerer, Warlock, or Wizard, Versatile, Sap