Chainlock is simply explained as "a freeform circuit" but I've also seen it referred to as a chain of LFOs. Either way, it pairs nicely with some Rollz-5 to generate pulse triggers. Reportedly, other external modules, e.g. Eurorack stuff can trigger nicely too.
Chainlock and Spikering also play quite nicely together pinging pulses off of each other (though some Rollz is still recommended).