"Grimm" just aired its 100^th episode and the mystery of the seven keys was more or less solved. But what happens now that Nick has the treasure?

The previous episode saw Nick (David Giuntoli) and Monroe (Silas Weir Mitchell) tapping into their inner Indiana Jones to find the treasure hidden in an underground medieval church. Unfortunately, they didn't escape unscathed as Monroe was bitten by another Wesen. Back in Portland, Adalind's (Claire Coffee) hexenbeist powers resurfaced and the Black Claw reached out to Capt. Renard (Sasha Roiz).

There have been hints that Adalind's powers will return. The character even mentioned it to Nick at one point in the season. But it was still a shock when it happened and it's obvious Adalind doesn't want her powers back.

"Getting her powers back completely jeopardizes their relationship, and then they're co-parenting with Kelly, so it's a much more global situation for her life than it was ever before," the actress explained to TV Line.

Aside from Adalind's returning powers, the biggest revelation of the 100^th episode was the piece of wood that miraculously healed Monroe. Could it be a piece of wood from the cross of Jesus Christ? In her explanation to Nick, Kelly Burkhardt (Mary Elizabeth Mastrantonio) mentioned that one theory was the knights hid a piece of the original cross.

A synopsis for episode 13 makes no mention of the Grimm's treasure but does hint at the fallout following Andrew Dixon's assassination. According to TV Muse, a local maskmaker is killing Wesen in order to make Luchador masks that imbibe the wearer with power. As Nick, Hank (Russell Hornsby), Monroe and Rosalee (Bree Turner) try to bring down this maskmaker, Capt. Renard contemplates Black Claw's offer to run for Portland's mayor. Meanwhile, questions arise over Eve's (Bitsie Tulloch) investigation of a recent incident.

A trailer for the upcoming episode, "Silence of the Slams," shows what Nick and Hank are up against. The clip starts with a man appearing to be conducting some sort of ritual. He's shown reading from a book while a mask is displayed beside him. The mask is that of a large cat and is described as one that "can give anyone Wesen strength." A man is seen putting on the mask and later shown winning in the wrestling ring. The masked man is definitely strong as he easily threw Nick clear across the room.

Nick and the others really have to be on their toes with this foe. How will they deal with him? And will Renard give in to his dreams of glory and run for mayor?

"Grimm" season 5 will return with a new episode on March 18.