funf act:
1. you can totally lose the dash abilityy the same way you could with the chickens:
saved the game, went ot fight the boss, got killed before the next savepoint.
ability gone, but also cant be reclaimed since boss room is cleared.
2. 100 pages? only if you beat it all in one run. period.
since bosses also drop the required pages and, even after dying and losing all pages, the boss' pages obviously dont respawn either.
so 100 pages only for no death hardcore people :-/
hopefully, the pages would give the 6th ability, otherwis there is an ability missing (the third subweapon beside chikenboom and boomerang)