Finally, i leveled an evoker, which is close to the stonespeaker in the playstyle except that Psionic touch will take the place of Rune weapon.
This should allow Strombolitta to level at a safer distance with a staff instead of short ranged weapon.
The ideal weapon would be the MI prospector rod, easy to farm but it's a long way to go up to act 5.
Here is the progress for Act I
No farm session except for specific charms (in caves) to achieve the artifact.
Edit:
No problem Bote, take care of you.