Sterwin has decided to go with conversation and wants your help in capturing the endangered Opha species of Guardians. As with Guardian Hunter, Sterwin will give you a special grenade that will capture the Ophas whenever they are critically injured (under 25% health). The only problem with Ophas are that they spawn Putti enemies that will gradually restore their shields, so you’ll want to kill those before trying to capture.

Equip the Monster Trap grenade mod and head along this corridor until you find the first Opha, which shouldn’t be too challenging. The second Opha you need is the Elder Opha, which spawns on the ring just outside the portal to the Sentinel last boss. This one is armored, but it’s moreorless a stronger version of the ordinary Opha.

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Just get the Opha’s health down to about half or so, then toss the trap grenade to capture it.

The third target is a Virtuous Opha, which is just a slightly more powerful version of the other ones, although the Puttis it spawns are elemental based. The last one will be the hardest, as it’s an Opha Superior, which you only fought one of during the last story mission. While it’s more of the same, they can create actual guardians from its stomach, as well as Puttis. Once you manage to capture it, bring them all back to Sterwin to finish.