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Agunimon: Spirit Evolution tree

Takuya Kanbara's Warrior of Flame line: from the ancestral AncientGreymon and the Child form Flamemon up through the Human and Beast Spirits, the Fusion, the Unified EmperorGreymon and the collective Susanoomon.
Spirit triggers

Susanoomon: DNA Digivolve

Koji's MagnaGarurumon completes the union
MagnaGarurumon
MagnaGarurumon
Unified (Koji)
+ EmperorGreymon = Susanoomon

EmperorGreymon: Unified Spirit

Takuya unifies the Spirits (Human + Beast) of five Legendary Warriors
AncientGreymon
AncientGreymon
Flame
Human + Beast Spirit (Takuya's own)
 AncientVolcanomon
AncientVolcanomon
Earth
Human + Beast Spirit
 AncientTroiamon
AncientTroiamon
Wood
Human + Beast Spirit
 AncientMegatheriummon
AncientMegatheriummon
Ice
Human + Beast Spirit
 AncientKazemon
AncientKazemon
Wind
Human + Beast Spirit
Images and names link to DigimonWiki/Fandom. Credit and license: Fandom community, CC BY-SA unless noted otherwise. Frontier has no partner Digimon: Takuya's Child form Flamemon Spirit-Evolves into these forms; AncientGreymon is the ancestral Warrior of Flame (lore links, not steps) and the origin of both the Human line (via Flamemon) and the Beast Spirit. Aldamon fuses the two Flame Spirits; EmperorGreymon unifies five Warriors' Spirits (see panel); Susanoomon is EmperorGreymon DNA-Digivolved with Koji's MagnaGarurumon (see panel), uniting all ten Legendary Warriors.