Engrossing; fascinating; gaining rapt attention; captivating. / Having the power to bind magically through the agency of a spell.

Something that is spellbinding, that causes rapt attention.

plural of spellbinder

(transitive) To captivate, or hold the attention of, as if by a magic spell; to entrance.

Third-person singular simple present indicative form of spellbind

In a spellbinding manner.