Legendary unobtainable via crafting loot

How about adding some weapons with special skills like evoker fang attack and more ?

Those weapons would only be obtainable via some hardcore boss battles and could only be repaired using smithing table.

This could be even a normal minecraft sword with a special effect, or... a whole new 3d modeled thing like trident.

For balancing issues new weapons shouldn't be superior to other weapons we currently have in minecraft, but their skills and special attacks might be a big plus in terms of how you fight.

Also the new weapons shouldn't be able to enchant via enchanting table as some of them would already posses a great enchantments (skills)

for example: 

A sword like "Chillrend" known from the TESV, found in the winter biome, deep inside a chamber with a let's say ice boss or something like that, 6-8 points of dmg but it can freeze opponent for 2 seconds.

this way we can keep somehow a stable dps for all weapons and let players find their best setup.