You can get nine Limited Time Craft Essences from the Halloween events held in 2017 - 2019 through Event Item Exchange in the Limited Time Event "Halloween Rising! The Queen of Dust and the Disciple of Darkness".

★★★★★SSR Maid in Halloween ATK 0　HP 750 (MAX: 3000) Skill Increase your HP Recovery amount by 60%

★★★★★SSR Halloween Princess ATK 250 (MAX: 1000)　HP 375 (MAX: 1500) Skill Increase NP Strength by 15% & begin battle with NP charged at 30% for yourself

★★★R Trick or Treat ATK 100 (MAX: 500)　HP 150 (MAX: 750) Skill Increase your Debuff Success Rate by 10%

★★★★★SSR Hero Elly's Adventure ATK 500 (MAX: 2000)　HP 0 Skill Increase Buster Card effectiveness by 10% & NP Strength by 20% for yourself

★★★★SR Wizard & Priest ATK 200 (MAX: 750)　HP 320 (MAX: 1200) Skill Increase NP Strength by 15% & HP Recovery amount by 10% for yourself

★★★R Mata Hari's Tavern ATK 200 (MAX: 1000)　HP 0 Skill Increase Quick Card & Arts Card & Buster Card effectiveness by 2% & Critical Strength by 5% for yourself

★★★★★SSR Aerial Drive ATK 500 (MAX: 2000)　HP 0 Skill Increase Buster Card effectiveness & NP Strength by 8% & begin battle with NP charged at 30% for yourself

★★★★SR Golden Wings ATK 200 (MAX: 750)　HP 320 (MAX: 1200) Skill Increase NP Strength by 20% & NP Gain by 5% for yourself

★★★R Nostalgic Form ATK 0　HP 300 (MAX: 1500) Skill Increase DEF & Buster Card effectiveness by 3% for yourself

For details about the Limited Time Event "Halloween Rising! The Queen of Dust and the Disciple of Darkness", please see the article linked below.

"Halloween Rising! The Queen of Dust and the Disciple of Darkness" Details: