Here are a few options, with explanations of their nuances:
* Scottish Gaelic: A combination of words would be needed. Something like "toistear bàis" (literally "harbinger of death") might work, though it's a bit more formal. A more forceful option could involve using a word that implies violence or destruction alongside "bàs" (death), but this would need careful contextualization.
* Irish Gaelic: Similar to Scottish Gaelic, a direct translation is not ideal. "tógálaí báis" (literally "raiser/builder of death") is grammatically correct but sounds awkward. "bringeoir báis" (literally "bringer of death") is closer, though it might sound more literal and less poetic. Again, using more evocative words to replace "bringer" would be better for a more impactful phrase. For example, a phrase focusing on the act of killing would be more potent.
To get a more accurate and evocative translation, one would need more context. For example:
* Is it a title for a person? A more poetic and fitting phrase might be necessary, perhaps referencing specific methods of death or a mythological figure.
* Is it describing a weapon or a disease? The focus would shift to the instrument or agent of death, rather than a person.
* What is the tone? Is it ominous, epic, clinical, or something else?
Ultimately, a skilled Gaelic speaker familiar with the context would be needed to craft the most effective translation. The options provided above are literal interpretations and lack the richness that a more nuanced translation would have.