Before I get to my main question, I have to note that Dispel Essence (and Channeling and Mentalism) in RM2 seem to be rather broken based on their descriptions. Cancel Essence states
"When a spell of the Essence is cast against the caster (of Cancel Essence), the attack spell must...." and clearly only affects attack spells against the CE caster.
Dispel Essence states "As Cancel Essence except the dispelling radius is in a 10' R about the caster (the radius moves with the caster). If the radius encounters and already existing spell, the spell must make a RR..." Because it's "As Cancel Essence" it applies to Essence spells cast against the caster of Dispel Essence. But there can be existing spells, and it can apply to something 10' away, neither of which makes logical sense 99% of the time. As written, it is a largely useless spell.
That the wording is bad is supported by comparing it with the description of Dispel Essence I and Dispel Essence Sphere I in RMSS. These affect "Any active spell from the realm of Essence" rather than just attack spells against the caster of Dispel.
Using the more plausible RMSS application of Dispel, it occurred to me that there are consequences for casters with familiars. If the caster or their familiar is within that 10' radius, their bond would be broken. Familiar is "Permanent" and under the spell description key, "A spell with a permanent duration may be affected by outside forces, e.g., the spell may be dispelled..."
And that means that an Essence user with a familiar would never want to cast Dispel Essence! They would likely lose their familiar. If another caster with a familiar entered the sphere of Dispel, or their familiar did, they would lose their bond. The familiar isn't killed, so would you apply the 2 week -25 penalty on all actions?
Has anyone else run into this, or does anyone know of a note/rule/whatever that would counter this thread of logic?