Don't get bitter, do get bitters

What exactly are bitters? In essence, they are aromatic liquid flavorings that enhance the complexity of cocktails. Typically created by infusing herbs, citrus, or other ingredients into alcohol, bitters are potent enough that you usually only need a dash or two for each drink. Angostura bitters, for instance, are a classic choice for an old fashioned. As a brand, the specific recipe is proprietary, but you can expect to detect notes of clove and cinnamon.
To expand your bitters collection, consider adding chocolate bitters, which work particularly well in bourbon cocktails. Unlike the spiced profile of Angostura, chocolate bitters introduce a delightful nuttiness to your drink. On the other hand, orange bitters can enhance the fruity elements already present in an old fashioned, which is often garnished with an orange peel and a maraschino cherry.
Interestingly, Justin Lavenue also suggested Cocktail Kingdom's wormwood bitters. Wormwood is famously linked to absinthe and the legend of the green fairy, a symbol of both creativity and the bizarre hallucinations associated with absinthe consumption. This spirit was even banned for a period due to such myths. While absinthe is known for its strong anise flavor, wormwood itself contributes a robust woody taste combined with familiar holiday spices.
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