If Lara was supposed to get strong enough to kill the Chimera instead of Merlin, she would have to be extremely powerful.
So far, Zayn had only heard rumors about the Colosseum but that was already enough for him to feel like never going there. Blessed and Normies could challenge the monsters that were captured and held in the Colosseum, and bets could be made for all kinds of possibilities.
These possibilities included whether the Challenger would survive, how long the Challenger would be able to stay in the ring, or if the Challenger would be able to defeat their opponents. Rumors said that the monsters facing the Challengers were usually extremely strong.
This was again rumored to have multiple reasons but Zayn didn't really have to bother thinking about the Colosseum's reasoning for letting Challengers face a monster that was supposed to be stronger than them.