Simon R. Green's Secret Histories is about Shaman Bond, aka Edwin "Eddie" Drood, black sheep of an ancient, superpowerful family (the Droods) that protects humanity from its nightmares. The books are a take-off of Ian Fleming's James Bond books with a supernatural element to them.
Apocalypse How: In Daemons Are Forever, Janissary Jane recounts how a parallel reality had been completely overrun by Hell's demons, forcing her mercenary group to annihilate that entire universe as a scorched-earth tactic. A similar doomsday-device is used to destroy the Hungry Gods' home universe at the novel's end.
Sunwrack — For putting out the stars one at a time.
Juggernaut Jumpsuit — Possibly makes the wearer invincible
The Time Hammer — For changing the past through brute force.
Winter's Sorrow — Size of a paperweight. Break it and you unleash the Fimbulwinter: an eternal winter that covers the world.
Dissector — the ultimate scalpel created by Baron Von Frankenstein. It can cut through any thing, neat as you like.
Dominator — A laurel wreath made from silver. The user's thoughts and wishes becomes other peoples thoughts and wishes.
The Merlin Glass — can be used to teleport and contact any Drood from the past and future.
Armor Is Useless: Averted except in three instances in the first book, when the strange matter arrow pierced the golden armor, when Eddie figures out how to merge it with the armor of his opponent near the end, and when dealing with Torc Cutter. Other than those times, the golden torc is indestructible as long as it is on.
Walker: "I could handle Good Time Georgie if I was unconscious." He smiled easily into Georgie's reddening face, completely unmoved by the man's size or presence or anger. "Are you sure you want to do this? Are you really sure I don't have my Voice anymore? Would I be here in Strangefellows, without my Voice to protect me? Perhaps you've forgotten all the terrible things I've done to you down the years. Or made you do to yourself. You're just a cheap thug, Georgie, whereas I... am Walker. Now go away and stop bothering me. Or I will tell you to do something deeply amusing and so extreme that people will still be laughing about it thirty years from now."
Beethoven Was an Alien Spy: Early on, Eddie mentions that many of the conspiracy theories in pop culture are true. Mr. Stab began his career and immortality as Jack the Ripper. A family really does (or did) control the world.
Played with in The Spy Who Haunted Me, when Eddie and the other competitors must track down the truth behind several stock cryptids and pop-culture enigmas (Bigfoot, Tunguska, etc). They all have a basis in something much weirder than generally claimed.
Merlin Satanspawn gave the family the glass which bears his name in payment of a favor.
Dead Boy from the Nightside and J.C. Chance of the Ghost Finders attend the Casino Infernale Summit meeting and turn up at the end for the final fight. The Little Lord, a minor character from the Haven stories, shows up as one of the gamblers in the Casino itself.
Chekhov's Gun: The James Bond like devices Eddie gets. Subverted in The Spy who Haunted Me (2009) since Eddie never uses the items his uncle gives him to his uncle's extreme frustration. However in From Hell With Love (2010) he uses the items he didn't use in the last book.
The arrow that makes it through the golden torc comes back in full force by the end of the first book.
Eddie sees an Armoury assistant testing a protein exploder in one book, and Molly gets to wield one in the next.
Endless Winter: Ultima Thule takes this Up to Eleven, being perpetually cold enough to chill Eddie even through his armor. Also, southern Siberia in Property of a Lady Faire is covered in snow, even though it's stated earlier in the same book that it's summertime.
Fantasy Kitchen Sink: Psychics, aliens, spies, elves, gargoyles, werewolves, ghosts, zombies, angels, demons, Frankenstein's creations, witches, interdimensional mercenaries, Lovecraftian monstrosities, satanists, superscience of various stripes and a few superheroes to boot.
Fate Drives Us Together: Subverted an Hell to get an agent cozy with the Droods. However, Roger actually does fall in love with Harry.
Instant Armor: The Droods' chief asset in their countless world-saving battles is the magical golden (or silver, in a couple of books) flexible armor that retracts into their torcs when it's not needed.
Light Is Not Good: The Heart, an otherworldly entity that's embodied as a gigantic diamond of eye-searing brilliance, is a murderous criminal that delights in corruption and infant sacrifice. The original golden armor it provided to the Droods was crafted from the babies their complicit leaders secretly fed to it.
Jack the Ripper: Mr. Stab performed several gruesome human sacrifices in Victorian Whitechapel in order to obtain immortality. It worked, but this form of immortality had consequences for which he was not prepared.
My Grandson Myself: Alexander King's real agenda in The Spy Who Haunted Me is to assume his grandson Peter's identity after self-rejuvenation and plastic surgery, while killing off several renowned up-and-coming rival spies to establish "Peter" as a worthy successor.
Shapeshifter Showdown: At Casino Infernale, this trope is offered as one of the Medium Games. Played with when Shaman competes, as he mostly battles his opponent in his human form, rather than transforming into powerful shapes.
Shooting Superman: All the freaking time, when mooks confront Droods in armor. If it's Eddie they're shooting, they'll eventually give up and try shooting Molly, only to find her magical shielding is no less invulnerable.
Lampshaded in Daemons: "So," I said. "I am left with just a few days to stop the bad guys from destroying the world and save the family from itself. If I hadn't already done this once before, I might be seriously worried."
What Happened to the Mouse?: When last seen in The Spy Who Haunted Me, Coffin Jobe had succumbed to his necrolepsy and died at the Independent Agent's secret lair. It's never mentioned whether he revived in time to leave before Eddie and Walker finished looting the place and blew it up. Even Jobe's cameo appearance in For Heaven's Eyes Only doesn't resolve the issue, as Eddie's near-death experiences are an enigma in themselves.
Who Wants to Live Forever?: Happens to Methuselah. He wants to leave earth because he's done and seen everything. He also wants break into heaven to enjoy its splendor.
Woobie, Destroyer of Worlds: Doctor Delirium, a villain who threatens to unleash diseases unless he is paid ransom in rare postage stamps — once a collector, always a collector. He sends his goons to steal the Apocalypse Door in order to make the world take him seriously.