Cleon
Legend
Shall we tackle the "solidify" ability first, then?
They seem to have three phases of existence - ethereal, incorporeal and solid.
That would give us something like this:
Manifestation (Su): A spectral wizard normally dwells on the Ethereal Plane where, as an ethereal creature, it cannot affect or be affected by anything in the material world. However, a spectral wizard can partially or fully manifest on the Material Plane. It takes 1 move action for a spectral wizard to partially manifest, 1 full-round action to fully manifest. It takes the spectral twice as long to manifest in areas of bright light, such as daylight or a continual flame spell.
A spectral wizard has two home planes, the Material Plane and the Ethereal Plane. It is not considered extraplanar when on either of these planes. Manifested spectral wizards can be attacked by foes from either the Material or Ethereal Planes, but are somewhat protected by incorporeality.
When a spellcasting ghost is not manifested and is on the Ethereal Plane, its spells cannot affect targets on the Material Plane, but they work normally against ethereal targets.
A partially manifested spectral wizard becomes visible but incorporeal on the Material Plane. It can pass through solid objects at will, and has an incorporeal touch attack. Its incorporeality protects it from foes on the Material Plane, but not from foes on the Ethereal Plane. Its spells continue to affect ethereal targets and can affect targets on the Material Plane normally unless the spells rely on touch. A partially manifested spectral wizard's touch spells don't work on nonethereal targets.
A fully manifested spectral wizard has assumed physical substance on the Material Plane. Fully manifest spectral wizards have no incorporeal touch attack, but can manipulate material objects, wield weapons and cast spells just like a material creature. It is not incorporeal to foes on the Material Plane, but is incorporeal to foes on the Ethereal Plane. Its spells affect targets on the Material Plane and Ethereal Plane normally, except its touch spells only work on material targets, they have no affect on ethereal targets.
A manifested spectral wizard always moves silently.