The Inferno has a whole bunch of different hiding spells built into it.
These are separate spells to mask different things. Getting them all coordinated and working together is quite complicated.
Normal “rings” or “Cloaks” can typically only block one or two things, maybe 3. For one thing you can’t get enough runes on a ring to do it all.
Some things you have to deal with.
Pass through/distortion of reflected and refracted light of all frequencies (including micro waves, radio waves, etc) body heat, animus, mana, aetherial presence etc.