The genius strategist of the Order of Favonius is a Cryo character and before unleashing his might on the enemy you will first need to upgrade the character a little. Here is the complete list of the materials needed for Kaeya.
Kaeya Ascension Material
Number required: 1
Number required: 9
Number required: 9
Frozen Tree (Level 60 and above),
Northern Wolf Challenge (level 60 and above),
Hypostasis Cryo (level 60 and above),
Oni Blade (level 60 and above),
Ancient Geosaur (level 60 and above),
Azhdaha's Challenge (level 60 and above),
Signora's Challenge (level 60 and above),
Abyssal Elementosaur (level 60 and up),
Tartaglia's Challenge (level 60 and above),
Synthesis
Number required: 6
Frozen Tree (Level 75 and above),
Northern Wolf Challenge (level 75 and up),
Cryo hypostasis (level 75 and above),
Oni Blade (level 75 and above),
Ancient Geosaur (level 75 and above),
Azhdaha's Challenge (level 75 and above),
Signora's Challenge (level 75 and above),
Abyssal Elementosaur (level 75 and up),
Tartaglia's Challenge (level 75 and above),
Synthesis
Number required: 46
Number required: 168
Number required: 18
Number required: 30
Number required: 36
Kaeya Talents Upgrade Materials List
Number required: 18
Number required: 66
Number required: 93
Number required: 9
Number required: 63
Number required: 114
Number required: 18
Number required: 3
If you're looking to upgrade your Noelle here is the complete list of the materials you'll have to farm to Ascend the Geo character and her talents.