Dagur wants to overcome his anger issues.
Easy enough, right? Well, not for an ex-berserk they titled as "Deranged". Half his life, Dagur was a maniac in power position and the other half a maniac thirsting for said power (and revenge). It's like putting a Changewing among a group of sun-bathing Gronckles.
Fishlegs—ever the smart and helpful guy—adviced Dagur to turn to botany and have his own little garden on Dragon's Edge to embrace his inner green thumb. Initially, the ex-berserk scoffed and denied, just to be reminded that "change starts small".
You were there to help him, which wasn't as easy as it might have sounded. Though his plan to grow Dragon-nip for Sleuther was surprisingly sweet, it didn't work out. Night Terrors would rip it out of the ground as soon as the first bit of green showed itself.
Onto flowers, then.
Nothing can ever go right, can it?
Dagur rejected any of your advice for "Dagur Junior" (the girl-flower he's growing). "She talks to me! I know what I'm doing!"
Completely oblivious to any signs that Dagur Junior was doing bad, he got caught up in a mission with the Dragonriders. To no surprise, when the two of you checked up on "her", the plant was dead.
Devestated and frustrated, the ex-berserk shoved his just slightly teary face into your shoulder.
"I can't do it! I will never change!"