Across Destiny 2's massive and forever-changing live service, the exotic weapon Telestohas proven to be consistently broken. Way back in the first Destiny, the first recorded bug was registered when it was noticed that Telesto could be used to produce special ammo in PvP, greatly increasing players' chances of killing other Guardians. Since its introduction into Destiny 2, the weapon has had many lingering bugs that were not fixed or noticed before they were patched; Telesto has been broken or bugged in Destiny 2 more than 35 times. It's broken the game so many times that there's a website dedicated to tracking the last time it broke the game, and if it currently is.
Telesto has been so problematic for Bungie because of how the weapon functions. While all of Destiny 2's exotic weapons work in interesting ways, Telesto is truly unique. The weapon fires explosive bolts, or spikes, that stick to surfaces, enemies, and sometimes things it shouldn't be able to stick to. The behavior of each bolt is completely unique within the Destiny 2 sandbox, which means that it can interact with basically everything that's not coded as Telesto-proof. Then, when throwing armor and seasonal mods into the mix, things can go from strange to completely broken when combined with the weapon in certain instances.
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Telesto's war against Bungie's development team is still ongoing, and its bugs and game-breaking antics are well documented. Over its long history in the game, it's enabled minor bugs in PvE such as sometimes providing players with additional damage with certain mods, or causing heavy ammo to spawn when it shouldn't. It's in PvP where Telesto has caused the most
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