About to go to sleep so I am gonna be really brief, but a freeze focused/OFF + TSS Spellbreaker can be and has been very good -> bosses in the end-game tend to have high freeze resist/‘reduced freeze duration’ so you need to run items/sets with ‘-x% reduced freeze duration’ (like the Mageslayer set) to make this kind of build work though!
E.g. here is one from ~January: [1.1.5.2] SpellBreaker through Olexra is Flash Freeze. 100 SR. 150-170 6m. 75-76 without death, full of provocation arena
and here’s an example I came up with that also incoporates Blade Spirits (they are really good) along w/ OFF + TSS: https://www.grimtools.com/calc/O2GYJGJZ