what are the -leadership item for dwarves and driods

[McSwan]

This is mainly for a droid army, ( 2 repair droid stacks 1 guard droid) as they are counted as dwarves?

Engineers badge is -20% for droid leadership.

There's a sword that decreases dwarf leadership requirements. Is that the elemental sword? What it's leadership reduction?

Anything else that gives special leadership bonuses/ leadership reductions to droids/dwarf?

edit : How does the steam armor help ? and does the telescopic lens help repair droid (+100% attack)