Piece de Resistance - Nine is Three Tripled

Nine is Three Tripled

This puzzle is part of the "Piece de Resistance" series. Go back to Part 1 (Ace) for the story.
Ace Two Three Four Five Six Seven Eight Nine...

Here is the transcription of the card...

Phase I - Truly. Tribond.

Bubonic
Egypt
Dogs

Phase II - Insert! Interpretation?

My leader was once, in short, an elementary British theatre.
My fellows achieve, register, and branch.
My tail is a Shetland fiddle.
And Quebecois use me to insert!

Phase III - Solution - Stepping Stone!

Hints

See Edit ;)

3, ..., 9

The whole thing has been solved. Anyone care to answer it?

• That hint seems self-referential ... Sep 17, 2019 at 13:23
• @Randal'Thor No, it's not. Sep 17, 2019 at 14:09
• The first section is pretty clearly rot13(cynthr (ohobavp cynthr, gra cynthrf bs rtlcg, cynthr qbtf)), but I have no idea what the second could be.
– Deusovi
Sep 17, 2019 at 17:08
• Im out of ideas. Here are my thoughts: Rot13(gur Ertvfgre vf n ybt (n ybt pna oenapu gbb), Furgynaq svqqyr vf n thr. fb jr trg -ybthr... ab pyhr nobhg gur gurngre cneg. Sbe cneg 3, gur fgrccvat fgbar vf arrqrq gb cnff n evire, thr va serapu vf n fznyy cnffntr gb pebff n evire. Znlor jr frnepu gur jbeq thr. Ab vqrn ubj gur Uvag jvgu gur pncvgnyf pbzrf vagb cynl.) Sep 17, 2019 at 19:56
• Rot13(V guvax "cynthr" vf evtug naq nyfb "___ybthr" sebz Onanaraxbcc. V guvax gur uvag zvtug ersre gb "Centhr" (n pncvgny pvgl) juvpu svgf jvgu nyy gur "thr" jbeqf. Gur Dhrorpbvf irefr zvtug or "rg" orpnhfr gung zrnaf "naq" va Serapu. Be vg zvtug or "pnerg" orpnhfr gung vf hfrq gb vafreg grkg.)
– JS1
Sep 18, 2019 at 7:18

Encouraged by the third hint I'll give a try

Phase I (solved by @Deusovi)

Tribond riddle:
- bubonic plague
- ten plagues of egypt
- plague dogs

Phase II - Insert! Interpretation?

Riley riddle

My leader was once, in short, an elementary British theatre.

An 'elementary' British theatre could be the London PALLADIUM.. (as suggested by @Stiv)
Palladium has the chemical element symbol "Pd"
From Omega Krypton Comment: Palladium used to be Pl in the early 19th century.

My fellows achieve, register, and branch.

log: a register is a log, a log can branch too

My tail is a Shetland fiddle.

A Gue

So we have Pl-log-gue -> Plogue

And Quebecois use me to insert!

the french word "plogue" means "plug", to plug in means to insert

Phase 3: Solution - Stepping Stone!

Looking at the source code of the question we find "Look out for capitals."
Well, having two words ending with -gue we find the capital of the Czech Republic, Prague (thx to @JS1)

Phase 1: Plague
Phase 2: Plogue
Phase 3: Prague
So 3 -> 1 -> 2 is a word ladder

Prague

Bonus

A stepping stone is needed to pass a river, gue in french is a small passage to cross a river.

Title - Nine is Three Tripled

Riddle 9 is divided into three parts

• rot13(Cnyynqvhz hfrq gb unir gur purzvpy flzoby Cy...) Sep 20, 2019 at 13:26
• @OmegaKrypton I'm confused. Was the answer rot13(thr)?
– JS1
Sep 20, 2019 at 20:20
• could you please state more clearly that the final answer is prague? (stepping stone in the sene of word-ladder). thanks! Oct 14, 2019 at 16:21