"Telekinesis enhancing weapon" how to build?

[Jerander]

Originally Posted by Lex_BR

This weapon is supposed to be an extremely expensive iridium-lined quarterstaff that can be used as a relay and amplifier for the wielder's Telekinetik powers. In other words, if someone with 10 ST an also 10 levels of telekinesis were to hit you with this staff you would feel the impact of the attacker's regular strenght + 2 or 3 times his telekinetic power.

My first thought was Striking ST with Gadget limitations.