The meta is constantly shifting in Warframe, and with Whispers in the Walls a whole slew of new and amazing mods were added. Such as the new Tennokai mods that drastically changed melee weapon viability. As well as exclusive mods for the new Grimoire class of weapons. But where do you find them? Well outside of the platinum marketplace, they can be found quite easily in a few activities. Here is where and how you can farm them!
Tennokai and Tome Mod Locations in Whispers in the Walls
These new mods in Whispers in the Walls do not actually drop from enemies. They will instead be rewarded from either of the new endless modes. Such as the reworked Mirror Defense mode:
As well as the new Alchemy game mode:
The new mods, as well as Mandonel parts will drop from rotation C. So, you will have a chance with every four rounds in Mirror Defense, and every four Crucibles in Alchemy. You can also try your luck in survival as well. But these two game modes are more interactive, and the time passes by much faster. So, i highly recommend you going into these instead of survival, but you are free to do so if you choose to. Also keep in mind that if you do the Steel Path variants, you will have a high chance at getting which mods you are looking for.
However, I hope this helps you in finding these new mods in Whispers in the Walls.