Could consider have one more line of information? Like:
Monster seems to have good magical capabilities.
Monster seems to have no magical capabilities.
Monster's magical capabilities overwhelm you.

In short: It shows how much to bogey casts spells, and
how devastating they are.

If there already is such a message/skill, I apologize
and go train some more.

Thanks,

~/A

In the echo of this excelent armour uptune and with reflextion of consider
loosing the ress message (that happened quite some time ago).

Monster having physical resistance/immunity would wear armour.

So when the random resistance generator decides that this monster has 100%
physical immunity, it would also bolt the monster to wear a full plate.
If it has 50% maybe it is wearing only a breastplate.

Then the defence factor would truly say how well the monster can defence itself
and the armour shows how well it handels (physical) damage.

A hits you.