A use for basalt

Basalt could be able to make a nether cage so you put Blackstone in a 3 × 3 square and put the basalt combuster which is crafted by surrounding a wither skeleton skull with basalt in the crafting table in the middle whatever goes in there can't get out and the basalt blocks turn unbreakable and it has a unbreakable roof trapping what goes inside until the one who crafted the combuster taps on it. The nether cage would be 10 blocks tall and inescapable.