This is a 25-year-old blended malt whisky, bottled from a single cask at cask strength. That means it was not reduced to a lower bottling strength, so it is likely to show a fuller texture and more concentrated flavour than many standard releases.
A butt is a large cask size commonly associated with long maturation, and extended ageing can bring added oak influence and a more mature character. For a novice drinker, expect an older-style whisky that may reward slow sipping and a little water to open it up.