u/AEMarling

Haste can be a powerful ability, but if your concentration breaks it can lead to lost turns of lethargy. This swingy, inconsistent spell is more risky than it is worth on honor mode, which rewards caution and does not require maximizing damage. I prefer using potions of speed or haste grenades.

However, against the final boss even the potions are a liability. I almost lost this last run because my main damage dealer became lethargic, lost their turn, and died. The final boss has some sort of retaliation that dispels haste. I would avoid it, except perhaps with haste grenades which I don’t think lead to lethargy.