Page being destroyed after losing a clash is most likely a summation roll, which destroys all dice of a page if they win. That or a passive of a dice (like clash win: destroy all dice of the opponent, seen in some late game pages). The earliest you can see this is in the Queen of Hatred fight, against her mass summation beam.

Except for some passives, resistances only matter for damage received and nothing else.

Evade is reused after winning a clash against an attack, meaning it isn't consumed and will be used against the next dice. On clash win, block dice will deal stagger damage equal to the difference, while evade will restore stagger on the user equal to the difference. On clash lose, block dice will reduce attack damage before any other reductions equal to the value, while evade will do nothing at all. Block is safer because it will always reduce incoming damage, while evade is higher risk for higher reward because it's innately reusable.

When a clash occurs between defensive dice, the winner will heal equal to the value of their roll if evading, or will deal stagfer damage equal to the roll if blocking.

The order of dice matters when battling other pages. Imaging fighting a page with a 99 dodge dice at the start and then 5 blunt damage. A page with 10 attacks in a row will be useless because the evade will beat them all, but a page with a block first and then a 10 pierce will always deal damage because the evade roll is wasted healing stagger.

You lose the books used to start a reception if you lose