The Echo Shield:

In action:

After the shield is charged by absorbing 10 hits (or getting disabled), the echo shield performs a mini sonic boom attack that knocks back the creatures ahead of you and stuns them for 3 seconds (Slowness 5).
After performing this attack the shield goes on cooldown for 15 seconds, during this time the shield can't absorb any attacks but can still be damaged.
The shield will play a noise after it is recharged.
The echo shield can be crafted with the following recipe:

Echo shield crafting recipe

The echo shield model:

Echo shield from the front Echo shield from the back

Technical details:

The echo shield has twice the durability of a regular shield
- Entities with the "echoplus:immune_to_shrieker_shield" tag will not be affected by the shield in anyway (By default includes the wither and the ender dragon)

Currently this mod only adds an echo shield item but more features are planned.
The license is ARR for now until I pick out a different license but feel free to include in modpacks/videos, no reupload platforms though please (other than sites like aternos). For anything else feel free to ask.

Echo+