|Primary caster||Reinforce Zwei|
|Magic system||Ancient Belka|
|Power||B (binding power)|
|First app.||StrikerS manga (ch.1)|
"Frierenfesseln" is German for "Freezing Fetters" (to Freeze+Fetters).
- It is first cast by Rein as a preset spell in StrikerS manga (ch.1) to capture a Gadget Drone for analysing.
- In StrikerS (ep.12), Rein casts it to freeze Lutecia Alpine and Agito in the underground.
Possible uses of the spell are noted as follows:
- In Reflection, Hayate Yagami casts a freezing spell to imprison Kyrie Florian from her feet to around her neck. However, it is yet to reveal whether this spell is Frierenfesseln.
- In Reflection, Rein casts a freezing spell around herself to freeze Kyrie's hand and Schwertkreuz's standby form. It may be an incomplete version of Frierenfesseln.