* Ever notice the generic looking {{Mooks}} that make up most of the Corrupted forces? The episode "Rising Fire" reveals that they used to be normal Corekai. That is, until they were captured and turned into Corrupted by Vilius himself, [[{{Understatement}} ouch]].
* Near the end of episode 5, the Corekai led by Beag form a [[GoThroughMe barrier]] to protect the Knights from Vilius WaveMotionGun attack. [[HeroicSacrifice Many of Beag's men are apparently killed doing this]].
* At the beginning of "Valley of Secrets" [[spoiler: Beag and two other Corekai]] seemingly fall to their deaths. Needless to say, [[RoaringRampageOfRevenge Guren and the other boys didn't take it very well]].
--> '''[[spoiler:Beag]]''': (''while falling into the chasm'') Farwell Knights of Tenkaiiii!
--> '''Guren/Bravenwolf''': [[spoiler: Beag!]] [[BigNo NOOO!]]
* Episode 16 "Oh No I Didn't" is full of tearjerkers, Ceylan has self-worth issues so bad that he considers leaving the team again.
** While on Quarton Ceylan and the Corekai are attacked by Slyger and Granox, who both transform into Titan Modes of their own and decimate the group. One particular Corekai who happens to be a big Valorn fan (he even shares the same green color scheme) gets killed mid-sentence.
--> '''Valorn Fan''': In the name of Valorn you shall not! ([[KilledMidSentence Granox smashes him with his mace before he can finish]])
** Actually, the soldiers all have different color schemes: Red, blue, yellow, green. Though the scene is still sad to witness.
* It's minor but, watching [[spoiler: Gen's]] VillainousBreakdown near the end of episode 23, when Guren tries to convince him not to go through with his plan.
--> '''Guren''': [[spoiler: Gen]] stop this! It's not too late to do the right thing! [[CallBack To flip to the right side!]]
--> '''[[spoiler:Gen]]''': (''grows angry'') And be weak! Why should I do that!?
* Episode 31 brings back the Guardians, only for them to become [[spoiler: [[{{Brainwashed}} brainwashed]]]] by Vilius.
** Guren and the others horrified reaction upon meeting the [[spoiler: brainwashed Boreas]] is understandable.
* In episode 33, [[spoiler: Guardian Notus]] is forced to attack the Knights. Yet unlike [[spoiler: [[DrunkOnTheDarkSide Boreas and Zephyrus]]]], he's able to resist Vilius control enough to tell the Knights he's sorry and can't stop himself.
** And then he explodes, just because.
* Guren's depression in episode 35 about not being able to access his new Elemental titan mode as easily as the others.
* "Too Close to Home" sees Mr. Nash [[spoiler: temporarily get brickified]]. Guren's reaction is ''heartrending''.
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