Temple Spirit

Temple Spirit is a customized monster that is found in all levels of the Forgotten Temple.

When many of them are grouped together, they can all go against you and strip your equipment.

To counter them, you will need 100 MDEF, 100 DEF, Neutral resistance, and either Fire or Wind resistance. It can be better if you can raise all three elements as much as you can with 100 MDEF and 99 DEF.

If you're a physical class, you can use Autocast Cards that will automatically cast skills when you use physical attacks. These cards can also work on Temple Seal:

Autocast Cards
The following table is taken from iRO Wiki.