Season 7 focuses on The Ninja against The Time Twins. The Time Twins are the Elemental Wizards Sorcerers Mages Magicians and Masters of Time from long time ago, during the Anacondrai wars. Long time ago Wu and Garmadon fought with the Time Twins and banish them using the Time Blade. The Time Blade is the main weapon that the twins control (there are 2 Time Blades). The Time Twins than return to the present to get revenge. Acronix and Acrux (the Hands of Time/the Time Twins) than team up and create the Vermilion Army (snake-like living bodies who can regenerate). The Ninja have a tough time against the Vermilion Army. It is than revealed that Kai and Nya's parents (Ray and Maya) were traitors and worked for the Time Twins. One evidence is revealed later on that Ray and Maya are the ones who created The Time Blades and revealed to be their captivities.