Heart of Chao
From Ephinea PSO Wiki
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Heart of Chao is a Mag cell that can be used on a level 140+ third evolution Mag with all of its stats at level 35 or above to evolve it into a 
Chao.
- Be aware that a level 140 Mag with 35/35/35/35 stats will evolve into a fourth evolution Mag, becoming ineligible for use with Heart of Chao. In order to avoid this problem, it is recommended to level one or more stats beyond 35 before raising the lowest stat to 35 while also targeting a stat distribution, character class, character gender, and Section ID combination that does NOT fulfill a fourth evolution requirement. Do not feed the third evolution Mag on any fourth-evolution-Mag-eligible combination at any point during level 140 prior to using the Mag cell. A quick-reference chart for fourth evolution Mag conditions is available here.
Availability
Item Present
Heart of Chao can be purchased from the quest 
Item Present for one Item Ticket.
Events
There is a 12% chance of finding a Heart of Chao from a Jack-O'-Lantern, obtained from a Hallo Rappy during the Halloween Event.
