Teras Kasi Archive

I aquired a +22 nym vibro motor recently. I plan on getting this made into a nice VK and then pick up TKA, im currently at unarmed 4. I would like to know if there are any equivilants to krayt tissue for melee weapons I can add to vks to make them better. I heard something about rancor teeth enhancing melee weapons but I cannot confirm this to be true. Can anyone give me tips for what Ishould ask a master weaponsmith when making a good vk with this?