The Yggdrasill Emergency Pulser Communications System, or YEPCS, is a variable energy pulse which can be used as a method of communication with a widely varying frequency range and a dynamic focus, from broadcast to point-to-point. It is limited to light speed, however, but is very custom and largely unknown.

Designed by Yuki Toshiro and used on the SRSS Yggdrasill and the SRSS Alucard, the system is integrated with a pulsing device normally used to manipulate matter outside the vessel. Its bandwidth is 0.1 Hz to 2.6 GHz, with a frequency sesitivity of 0.01 Hz. The average frequencies used are in the range of 800 MHz to 1.2 GHz. The super-low frequency communication system is good for covert communications, though the frequency level dictates the type of communication possible.