enemy caster w/ Reactive Counterspell - obnoxious?

[Brother MacLaren]

My PCs (7 @ 15th-16th level) are about to engage in the penultimate battle of the campaign. Unbeknowst to the PCs -- who plan the old scry/buff/teleport -- the bad guys are well prepared because they have been scrying and spying on the PCs.

15th-16th level PCs who do NOT use Detect Scrying (24-hour duration) every day deserve whatever happens to them. Mordenkainen's Private Sanctum on your base is also essential.

 

[ThirdWizard]

Keep in mind:

To complete the action, you must then cast the correct spell. As a general rule, a spell can only counter itself. If you are able to cast the same spell and you have it prepared (if you prepare spells), you cast it, altering it slightly to create a counterspell effect. If the target is within range, both spells automatically negate each other with no other results.

The PC will be hampered, but may still be able to use Close range spells, and will definitely be able to use Touch range spells unless the opposing spellcaster has a death wish.

 

[frankthedm]

If it works, the NPC should use it. Pure and simple. If the shuts someone down or causes a TPK so be it. NPCs are as entitled to effective tactics as PCs are.

If a tactic is so strong that the only way around it is a "gentlemen's agreement" not to use it, it needs to be house ruled out of the system.