Coliseum should be renamed to "Destroy the tower" mode. Coliseum became something where people focusing only to kill the tower no matter what. This is not pvp anymore, just a disgusting shitshow.
I stopped seeing this once I jacked up my arcane caster to max insight. In fact, I get people in coli surrender as soon as their pan goli/great sage/renee ven barrage fails. It's more satisfying than a 3 win streak.
maybe later they make the system like
for Colis "Until all heroes been deployed tower is invulnerability to any atk"
for BS "Until 3 or 4 building is destroyed bastion is invulnerability to any atk"
i lost for words seeing penthesilea divine can be used to target bastion in BS
just sent another demon which slightly stronger.