The Guard Rod has Sar, the Mahlay Dagger has Nafoi
This two are interesting. While Guard Rod wasn't embedded with techs by any esper (since that weapon was always in Ryucross), Mahlay* dagger was a brand-new technological weapon created by Hahn (I didn't knew those possibilities but now I found that the Mahlay shield can also cast deban). Hahn's weapons must have been influenced by Rune's flaeli at Tonoe's cave and Rika's shield power. Since Rune was using a wood cane which could carry a small tech like "res" Hahn must have thought that with a resistant weapon could had a powerful tech like nafoi (the techs Hahn choose were precisely the ones he (or his body’s DNA) isn't able to have, but the metal(s) he chose can have it). While going to Tonoe he must have asked Rune how to put powers in solid bodies (objects)... this is speculation but he seemed to be the only one interested in this kind of things at the time.
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* - Is Hahn in any way related with Baya Malay? At least Hahn's last name (Mahlay) is similar to that. Baya also seems to be a first name since the seller at Termi has a similar name - "Bayamare". Well, bayamare can also be “Baya-Mare (the name of a small town in northern Romania) or "Baya Male" - "Baya Malé" - Baya Malay). Baya Malay (location in PS1) can be a name of a person since Aiedo comes from a guy called "Aiedo Hernandez", probably the person who approximated most to a gubernator at that time.
I have other questions:
The enemy "Shadow Saber" uses a weapon called shadowblade. After killing him Chaz may pickup that weapon but when using it he never manage to cast the technique "deban" like the previous owner. He can only cast death, because that spell turns on automatically with a swing at the enemy. We must also remember that Hahn can perform "deban" with his Mahlay shield and he can't with shadowblade.
Has shadowblade the "deban" power? or when "shadowsabers" rose the sword were simply doing a movement to cast that tech in the same way they would cast it without any weapon? If it has not the power how about the tech witches? Were they using their canes do amplify their own power (gifoi, giwat, gizan, gisar, gires)? or in this case the canes were the only source of their power?