Really? I wasn't the DM and I haven't read it extensively. I thought it was any Dex-based save?
To play Devil's Advocate, what would have happened to the paladin taking full fireball damage?
I've been reading this thread with interest. One of the points is that Legendary Resistance only applies to effects that have a save. This seems to me to be a significant weakness of the ability. Consider the Tarrasque vs Maze: Maze has no saving throw, but uses an Int ability check. This is pretty much autofail for the monster until it rolls a natural 20. Consider also the humble Sleep spell, as used in the OP's encounter: no save at all, so Legendary Resistance does not apply. It seems to me that Legendary Resistance should apply to everything.
I've been reading this thread with interest. One of the points is that Legendary Resistance only applies to effects that have a save. This seems to me to be a significant weakness of the ability. Consider the Tarrasque vs Maze: Maze has no saving throw, but uses an Int ability check. This is pretty much autofail for the monster until it rolls a natural 20. Consider also the humble Sleep spell, as used in the OP's encounter: no save at all, so Legendary Resistance does not apply. It seems to me that Legendary Resistance should apply to everything.
I've been reading this thread with interest. One of the points is that Legendary Resistance only applies to effects that have a save. This seems to me to be a significant weakness of the ability. Consider the Tarrasque vs Maze: Maze has no saving throw, but uses an Int ability check. This is pretty much autofail for the monster until it rolls a natural 20. Consider also the humble Sleep spell, as used in the OP's encounter: no save at all, so Legendary Resistance does not apply. It seems to me that Legendary Resistance should apply to everything.
You just wasted your one level 8 spell slot by putting the Tarrasque in a maze. Unless the party is running or needs time to heal, why would you do it?
I read Shield Master. It does work like evasion for the cost of a reaction and does full damage if save failes. What doesn't work is the shield bonus providing a bonus on Dex saves against AoE effects. The save bonus only works against effects that target only you. The part where you can use your reaction to take no damage does not have that language. He rolled a natural 20 on the save. So he would have still taken no damage.
I picked Maze as an example. There are other debilitating spells which have no save. For example, Banishing Smite has no save for the banishment effect, Colour Spray, and I also mentioned Sleep.