Sculk Gem

[Yushaa]

An echoshard named &9sᴄᴜʟᴋ ɢᴇᴍ when right clicked shoots a sonic boom that does 7 hearts of damage and has a 250 second cooldown and is obtainable by a command

 

[NixTer]

Try this

command givegem <player=%player%>:
    permission: *
    trigger:
        set {_d} to echo shard of mending 1 with all item flags named "&9sᴄᴜʟᴋ ɢᴇᴍ"
        give arg unbreakable {_d}

on right click:
    name of 1 of player's tool contains "&9sᴄᴜʟᴋ ɢᴇᴍ"
    player has player's tool on cooldown:
        stop
    loop blocks between block 1 infront of player and block 20 infront of player:
        make 10 of sonic boom at loop-block
        loop entities in radius 1.5 of loop-block:
            damage loop-entity by 7 if loop-entity is not player
    set item cooldown of player's tool for player to 250 seconds