Ple-Sen
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If Eledar attacks now, he will destroy himself along with Mariho, which is undesirable.
Added 17 minutes later
Ment, the Chaos Daemon damages walls, but you can't throw it through the wall. Unless you throw it right next to the wall, and he is right next to it on the other side.
Added 10 minutes later
Okay, I suggest the following:
Eledar backstabs, and Sarnissa summons walls around Raing to trap him. If Mariho doesn't retreat, Sarnissa teleports to help Eledar. Then we shoot Raing, if it's possible to shoot through such barriers from the wall. If not, we can simply block the passages. Bloodshot is too expensive for 900 HP! And I don't really like the black hole option.