What triggers Leo's first evolution?

Near death in a sewer, the Omni-Evolution System activates and transforms his Bottom-Feeder talent into the Abyssal Black Drake.

Why does the Watson clan target Leo?

He cripples Charles Watson in a public arena duel and rejects a military post, sparking a blood feud.

SSS-Rank Bone Dragon: Rise of the Forsaken

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SSS-Rank Bone Dragon: Rise of the Forsaken — Common-born Leo transforms a ridiculed F-rank talent into an SSS-rank Bone Dragon to survive noble persecution and uncover his lineage.

Leo awakens the derided Bottom-Feeder talent, prompting his S-rank fiancée Luna to publicly end their engagement. Noble Charles Watson beats him unconscious and abandons him in a sewer, where imminent death triggers the Omni-Evolution System. The system rewrites his ability into the S-rank Abyssal Black Drake, enabling his escape. Leo cripples Charles in an academy arena duel and refuses a military commission, igniting a blood feud with the Watson clan. During a wilderness trial, bribed instructor Robert attempts to assassinate him; Leo kills Robert and sends his severed head to the Watsons as a war declaration. Operating as Nightfall, he secures the Frost Lotus at a black-market auction and maims heir Victor in a death duel. Desperate, Watson lord Arthur allies with the Shadow Guild to poison dignitaries and launch a coup. Leo storms the banquet, executing Arthur and guild vice-leader Malachi. With his dying breath, Malachi detonates beast-luring incense, summoning a hundred-thousand-strong horde led by Beast King Cerberus. General Hayes betrays the city and flees. Leo stands alone against the tide, burning all evolution points for a second hyper-evolution that awakens the SSS-rank Calamity Bone Dragon. A single strike eradicates the horde and the Beast King, saving Valoria City. Declining homage, he departs into the wilderness to investigate his parents' disappearance.

Quick answers

What triggers Leo's first evolution?: Near death in a sewer, the Omni-Evolution System activates and transforms his Bottom-Feeder talent into the Abyssal Black Drake.
Why does the Watson clan target Leo?: He cripples Charles Watson in a public arena duel and rejects a military post, sparking a blood feud.