Credit to @CrazyShir0 for sharing this with me over voice chat

CREATION

Secondary Creation

x🜂xx🜃x     Fire + Earth = METAL 
x🜂xx🜁x     Fire + Sky = LIGHTNING
x🜂xx🜄x     Fire + Water = CHAOS 
x🜁xx🜄x     Sky + Water = AURORA
x🜃xx🜄x     Earth + Water = SHADOW
x🜁xx🜃x     Sky + Earth = CELESTIAL

Tertiary creation

x🜃xx🜂xx🜄x   Shadow + Metal = MYSTERIOUS
x🜃xx🜂xx🜁x   Lightning + Metal = DEMONIC
x🜃xx🜄xx🜁x   Shadow + Aurora = ETHERIAL
x🜂xx🜄xx🜁x   Lightning + Aurora = PRISMATIC

Quaternary creation

x🜂xx🜄xx🜁xx🜃x    Fire + Water + Sky + Earth = RAINBOW

OFFENSIVE EFFECTIVENESS

Primary element

EARTH WEAKNESSES: Sky, Aurora, Prismatic, Lightning
SKY WEAKNESSES: Earth, Metal, Shadow, Mysterious
FIRE WEAKNESSES: Water, Aurora, Shadow, Etherial
WATER WEAKNESSES: Fire, Lightning, Metal, Demonic

Secondary element

METAL WEAKNESSES: Aurora, Sky, Water
LIGHTNING WEAKNESSES: Shadow, Water, Earth
SHADOW WEAKNESSES: Lightning, Fire, Sky
CELESTIAL WEAKNESSES: Chaos, Fire, Water
CHAOS WEAKNESSES: Celestial, Sky, Earth

Tertiary element
DEMONIC WEAKNESSES: Etherial, Water
ETHERIAL WEAKNESSES: Demonic, Fire
PRISMATIC WEAKNESSES: Mysterious, Earth
MYSTERIOUS WEAKNESSES: Prismatic, Sky