every 1 real second:
        loop {GeneratorObsydianu::*}:
                if block above loop-value is air:
                        set block above loop-value to obsidian
On place sponge:
        add location of target block to {GeneratorObsydianu::*}
on break sponge:
        loop {GeneratorObsydianu::*}:
                if loop-value is location of target block:
                        remove location of target block from {GeneratorObsydianu::*}