Hey guys
I don't like having always the same build, so I'm trying a dual frozen orb / enchantress
I maxed orb + sinergy and some points in cold mastery, now I'm using my points in enchant, but at level 18 the fire damage is ridiculous (78-104) considering that I'm in hell (character level 75).

Now, some questions:
Fire mastery damage increase will work also on enchant for merc?
Using a phase blade, will I be able to hit enemies? Consider that main skill will be orb, so my gear will mainly be for caster. Else, should I use bow? Or just rely on my merc?
Will the enchant damage ever be enough to be effective? On me or on my merc

enchant isnt a very good dmg spell until late game with charms+prebuff gear. dmg can stack with the explosive bolts from stuff like demon machine, which is a fun build

fire mastery will apply to the enchants you cast whether on yourself or your merc. enchant applies a %ar buff so your AR will still be very low unless you are using a weapon with fools mod or angelics for example.
it will provide a noticeable AR increase to your merc, but the fire dmg will be low as you have noticed.

going for a hybrid build (like melee+caster) is never a good idea until you got the necessary gear to support both aspects well enough to make them both viable. up to that point, focus on one or the other