Halloween 3

Confess (to)

Gruesome adjective that's considered rude when used as an adverb across the pond

A Shining scrawl, and a clue to the form that the across answers must be written in

Go Boo!

Sentence which a witch might wish to avoid

Second-longest river in Poland, which forms 116 miles of its border with Germany (and a cop-out when you just want to make the crossword grid work)

Last words, perhaps

Creator of Watson, the computer system developed to play Jeopardy! and 3rd Herald of the AI Apocalypse

Tolkien Terror

Verdant