Hello there,

As per Wiki:

• Tenet Spirex: Shoots projectiles with extreme speed; headshots speed up reloading.
• The weapon's max rank caps at 40 after 5 polarizations - max rank increases by 2 per Forma added (similarly as the Paracesis).
• All Tenet weapons deal innate elemental damage in addition to physical damage. The amount of this damage is random, ranging from 25-60%, while the type of element is determined by the Progenitor Warframe, as per the table below:

According to the above, I added exactly 5 forma to this weapon, so we can obtain Mastery Points from it.

In this case, I recommend picking Magnetic as an elemental. Yes! Impact!

Let's get to the point. This sidearm is crushing! Literally and figuratively.

Literally thanks to the build, and figuratively, because at the moment it is probably the most powerful side weapon in the game... check this build to see for yourself. Most effective against groups of enemies. Grouping skills come in handy here.

This is it. AIM FOR THE HEAD!!!

Enjoy, THeMooN85