History of Better Together

Better Together is a Crucible triumph with two alternative routes: "Defeat opponents while your team holds Zone Advantage in Control. Bonus progress during Power Play. OR Defeat opponents with final blows from any ability in Eruption." The objective is 8 opponents defeated.

How to complete

• Control route: Holding two zones gives your team Zone Advantage (more points per interval than the enemy). Capturing all three zones triggers a Power Play (per TheGamer's Iron Banner guide). Get kills while holding two or more zones; kills during Power Play give bonus progress. Capture zones first, then defend them.
• Eruption route: Eruption is an Iron Banner mode built around ability use: two kills in a row give the Surging buff, which refills ability energy per kill, and five kills make you Primed. Use grenade, melee, class abilities and supers for the final blows. Surging refills energy, so chain ability kills.

Notes

Per the objective, 8 opponents is the total. Sources I opened describe the mechanics but not this triumph specifically; its seal or category and any reward are not confirmed.