Post by Bobby Durrett
I redid these tests with movement. Instead of hitting . every time I
moved back and forth adjacent to the V vampire lord. [...]
The effect of displacement is actually pretty tricky. In general, it is more
effective when you're moving, especially when multiple monsters are
trying to target you. The longer that you remain it one spot, the more
likely they are to figure out that spot. Once they do, they don't forget.
If the attacker failed to correctly guess your position on its previous move,
it will have to guess again on its new move _unless_ you happen to have
moved into the spot that it guessed on its previous move. So that's one
exception to the general case about being more effective when you're
If it did correctly guess on its previous move, it won't bother guessing on
its new move if you're still at that spot; it will just target your true location.
Note that if you are moving faster than the attacker and move away from
a correct guess, then move back before it had a chance to make another
move, it will be as if you hadn't moved at all--the old guess will 'still' be
correct and it will just attack. That's the other exception to the general
case about moving.
Digressing from displacement to MC... note that cloak of displacement
was already only MC2 in 3.4.3 and earlier versions. It's been downgraded
to MC1 in 3.6.x. Cloaks of invisibility, cloak of magic resistance, and elven
cloak were downgraded from MC3 to MC1. Oilskin cloak, robe, plate mail
(ordinary and crystal), and mithril-coats (both types) were downgraded
from MC3 to MC2. Cloak of protection has become the only way to get
MC3 from a single item, but wearing at least one ring of protection boosts
MC by 1 (unless it is already at 3). Wearing a second such ring does not
give a second boost. Eating such rings while polymorphed or receiving
divine protection affects AC and increases minimum MC from 0 to 1 but
does not otherwise enhance MC. I don't recall offhand whether ring of
protection stacks with that increased minimum or just duplicates it.
Enlightenment and end of game disclosure now report this previously
hidden form of protection so it is feasible to figure out that it exists.
Working out how to acquire is harder, and figuring out what it accomplishes
is still a blackbox.