Echo Shard Armour/offhand item

The creation or finding of, Echo Shard armour or an offhand item within chests would yield invisibility from a summoned warden. The caviat of this would be it would take durability damage based on how close you are to the warden every 10 seconds or so. The offhand item can be created by finding in loot chests, or in the case of being armour would be created using Echo Shards by finding the shards like usual in chests. Maybe combining the shard with skulk blocks to form ingots. This armour/offhand item would prove useful paired with swift sneak.