reading on what you wrote...
WW on any summons seems strange....even permanent summons.
and the rock paper-cisor is interesting... never thought of it like that. However you noticed non of them are available to good civs .... (save FoL... but FoL is not for REAL GOOD civs... only for tree-huggers hippies)
(oh, and if it is true that skellies/spectres quickly get the buffed +10% or even +20/+30 from the caster, normally, by that time, you should have at least +2 or +5 xp on unit creation.
so your stygian or diseased corps should at least have combat 1 or maybe even combat 2 or combat 1 and shock 1 ... so between +20 and +60 against skellies and specters, not counting city defense or terrain defense !
oh, and stygian guards heal better than other 'counter' units due to march)
so IMO, skellies are only worth it against the AI... but all that is OP against the AI might not be OP in MP... and might even be quite weak (see impersonate leader) or even "Hidden nationality units" ...
further the real issue with spectres is that their natural counter doesn't work (so that you have to rely on stygian guards that are not summons nor spells :
DESTROY UNDEAD kills any Skelly stack... especially as skellis, as "permanent summon" are un-movable on the turn they were invoked.
However this couter doesn't work with spectres. Destroy undead can only kill spectres that were invoked in defense of the caster OR spectre that survived their suicide attack.
(indeed, IIRC, spectres are temporary and can move on the turn they are invoked).
so either spectres can be rendered permanent (+noxp-gain) so they become immobile on first turn
OR
Destroy undead needs a balancing boost :
-destroy nearby undeads (as current)
-give a temporary (1turn) +50% (or+25%) against undead (or against death -unholy?-str) promotion to units in the stack.
my 0.2
WW on any summons seems strange....even permanent summons.
and the rock paper-cisor is interesting... never thought of it like that. However you noticed non of them are available to good civs .... (save FoL... but FoL is not for REAL GOOD civs... only for tree-huggers hippies)
(oh, and if it is true that skellies/spectres quickly get the buffed +10% or even +20/+30 from the caster, normally, by that time, you should have at least +2 or +5 xp on unit creation.
so your stygian or diseased corps should at least have combat 1 or maybe even combat 2 or combat 1 and shock 1 ... so between +20 and +60 against skellies and specters, not counting city defense or terrain defense !
oh, and stygian guards heal better than other 'counter' units due to march)
so IMO, skellies are only worth it against the AI... but all that is OP against the AI might not be OP in MP... and might even be quite weak (see impersonate leader) or even "Hidden nationality units" ...
further the real issue with spectres is that their natural counter doesn't work (so that you have to rely on stygian guards that are not summons nor spells :
DESTROY UNDEAD kills any Skelly stack... especially as skellis, as "permanent summon" are un-movable on the turn they were invoked.
However this couter doesn't work with spectres. Destroy undead can only kill spectres that were invoked in defense of the caster OR spectre that survived their suicide attack.
(indeed, IIRC, spectres are temporary and can move on the turn they are invoked).
so either spectres can be rendered permanent (+noxp-gain) so they become immobile on first turn
OR
Destroy undead needs a balancing boost :
-destroy nearby undeads (as current)
-give a temporary (1turn) +50% (or+25%) against undead (or against death -unholy?-str) promotion to units in the stack.
my 0.2