How does Unholy Might work with other minions in 3.25

In the Patch Notes the interaction between Unholy Might and Blink/Mirror Arrow Clones of Prismatic Clones was changed:

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The Elemental Arrows fired from Prismatic Blink or Mirror Arrow clones now correctly use skill damage conversion (100% Fire, Cold or Lightning). This means that with other sources of non-skill conversion such as Unholy Might, the Elemental Arrows deal entirely 100% Elemental Damage, instead of 50% Elemental + 50% Chaos Damage (assuming using a physical bow and no other sources of flat added damage).

Will other minions such as Summon Raging Spirits with Unholy Might have 100% of Physical converted to Fire Damage, or will it be 50% to Fire Damage, and 50% to Chaos Damage.

How will it work with other minions with conversion skills such as Raised Spectres?

You quoted a change specific to Prismatic Blink, not Unholy Might. Specifically it fixed a bug where you could get Unholy Might with a skill that can only deal elemental damage, not chaos. There won't be a change to minions other than the specified clones. Basically you were converting damage up to have your damage to chaos with Unholy Might, and then the chaos portion should have been hitting for 0.

With conversion in general, if you have 100% or less conversion, you get the valued stated. If you have more than 100% conversion, it equalizes to 100%. I.e. if you have 100% physical to fire, 50% physical to cold, and 25% physical to chaos, it equalizes to 57% physical to fire, 29% physical to cold, and 14% physical to chaos.