Book of Vlad Slot by Endorphina

Most "Book of" slots pick a single expanding symbol when the bonus triggers. This one can hand you several at once, and that's the whole reason to play it. Three or more of the gilded Book land you 7 free games, and from there the Book stops being the focus. Every regular symbol carries its own accumulator, starting at 5 cells and climbing as high as 12.

Filling those cells is what you're tracking. Any symbol that lands wearing a blood-drop indicator drips one cell of its accumulator, and it counts even when that symbol isn't part of a win, so dead-looking spins still move things forward. The moment an accumulator fills, three things fire together: that symbol becomes a special expanding symbol for the rest of the round, every other symbol gets an extra cell added to its accumulator, and you bank 2 more spins. Then that accumulator switches off. Because the Count, the castle, the blood goblet and the gargoyle each run their own counter, you can end the round with three or four different symbols all expanding, paying across adjacent and non-adjacent positions on enabled lines, with only the count on the reels mattering, not where they sit. The Book wild can't stand in for those special symbols once they're active, so it goes back to its base-game job. And the round retriggers on 3+ scatters for another 3 spins.

If you don't want to grind out the trigger, the Bonus Pop button on the left buys the 7 free games outright, opening with a base spin that drops the scatters for you. Anything Bonus Pop pays can't be sent to the Risk Game, which is the standard Endorphina card draw: pick a face-down card to beat the dealer, double up to ten times, joker beats all and never lands in the dealer's hand. There are also network Grand, Major and Minor mystery progressives drawn at random, with a bigger bet improving your odds.

The board sits in a moonlit forest of bare black trees under a cold blue sky, the reels enclosed in an ornate silver-grey border below a blood-red banner. Premiums are straight Dracula lore: a pale, red-collared Vlad, a turreted castle, a chalice brimming with glowing red blood and a crouching stone gargoyle, with gold gothic 10 J Q K A doing the low work. Midnight blue and blood red throughout, classic horror dressing for a bonus that turns the usual one-symbol Book trick into a pile of them.