Hello everyone and welcome to my 264th analysis, this time featuring Gualgui.
Overview: Gualgui has a good Base Speed and access to an extremely wide range of Torture effects, which she traded most of her raw damage for. CD Activation is a strong deny method, which gives Gualgui an advantage over most deniers - it is even more useful when you consider the fact that it is the best weapon against Artifacts, whom Gualgui can't do much else against. In addition, she gains an Area Torture Immunity SC at Rank 3, an immensely helpful buff. These collectively make Gualgui a great denier.

Rank 0: Hardened: Pretty basic and good to have.
Rank 1: Hardened + Possession Immunity: Immunity to deny methods is very good to have, especially Possession, meaning enemies can't turn her against you.
Rank 3: Hardened + Possession Immunity + SC: Area Torture Immunity: This counters Torture SC strategies and most other monsters' attacks like Marquis de Flambe's All Against One, and is extremely helpful to have.

-Pit Viper Bite
-Curse of Ancestors
-Dark Ritual
-Song of a Drowner/It's High Noon/Drowned in Sand
Runes: 3 Speed
Mutant Rune options: Speed&Life
Relics: Masks and Staves

Build Explanation:
Pit Viper Bite is Gualgui's AOE deny attack, activating the CDs of all enemies and applying Poison to them. Curse of Ancestors not only comes with Curse, a powerful Torture, but it's also a single target CD Activation for Dodge Area monsters who avoid Pit Viper Bite. Dark Ritual is a free Bleeding on all enemies, and having extra turn attacks in general is very useful - plus, you can follow this up with Pit Viper Bite to not only deny your enemies, but also apply both Poison and Bleeding to them. The last slot depends on personal preference and team comps; Song of a Drowner is focused on draining the Stamina of enemies, and it applies Drowned and Nightmares, two uncommon Tortures, to all enemies - the latter can allow an ally to use their Nishant's Sword. It's High Noon is an AOE 30% Stamina Drain with Quicksands attached to it, adding a powerful Torture to Gualgui's arsenal. The last option is Drowned in Sand, the best actually damaging move Gualgui has. It applies Quicksands and Drowned to a single enemy and it gives her a weapon against CD Activation because it has 0 CD.
3 Speed with Life Mutations is a given on a denier.

Teammate Options: Gualgui is a master of Tortures, but she doesn't have room for her Sunburn move, so having Draghar alongside her can fix this. Make sure to stop supports and Artifacts, as the former can clean the Tortures Gualgui applies and the latter is unfazed by them. You can use Trait Disable to help with Artifacts. For more Teammate options, check out this article.

Countering Gualgui: Having a Torture Immunity of your own, like Warmaster Babari, Olnir, or your own Gualgui, almost completely disables any damage Gualgui might deal to you. For more Counter options, check out this article.