Fagerson was just 20 when he started the PRO14 grand final in 2019, and he is one of five Warriors who remain from the squad that lost narrowly to Leinster at Celtic Park.
"We had a lot of boys after that 2019 final who moved on to pastures new," Fagerson told BBC Scotland Sport. "The great thing is we've got a group that's been together for a couple of years now.
"We've been through tough times. Last year in the Challenge Cup final we didn't really fire a shot. That was an incredibly disappointing point for this group.
"But we've banded together, we've been here for another year or two and it feels like we're building something really special here. There's so many people from various cultures all coming together to build those relationships."
The Warriors have put themselves in the mix for a home quarter-final and, potentially, a semi-final if they can keep their place on top of the URC.
"Home advantage plays a massive role," Fagerson said. "Not only do you get to play in front of your friends and family, but you wake up in your own bed, you come in and have Scotstoun rocking.
"It's somewhere we absolutely love to play and the fans are incredible here. To have ourselves in a position where we could have a home quarter-final or a home semi-final, whatever it may be, it's a pretty cool opportunity."