[Gara] Nuking Build

This build is mainly for speeding through defence missions but is also viable for missions like extermination or survival.
Unlike most builds that focus on stacking damage on splinter storm, in this build you ignore that ability for the most part as you want to be cycling your 4 and 1 as fast as your energy regen will allow (this is why you want both energy siphon and zenurik, with energize for the 1-2 orbs you'll have time to collect between waves).

For defence, it is important to find locations where you cover as many enemies per nuke and have them killed as close to their spawns without compromising other spawn locations. this will allow you to easily clear waves in under a minute on many tilesets.

If you are having energy issues you can run a weapon with the suda or red veil syndicate effect for the 25% base energy restore, suda also gives you an increase to energy capacity which helps buffer costs for the waves, while red veil gives movement speed to help energy collection. But you can use arcane consequence for movement instead as NOXs will almost always be the last enemy left standing so you'll easily be able to proc it on them.

you could also swap continuity for a streamline however this makes running eclipse impossible and prevents you from reaching max-height on your wall which handicaps you on tall tiles such as the terrible new corpus ship defence.
[Augur Reach] is another flex slot, where you could run [Augur Secrets] if you want more damage at the cost of range 64.6m at max (lower if you don't full channel the 4) down to 57.7m radius max.
For auras, you can go with CP, [Growing Power] instead of [Energy Siphon]. but I wouldn't recommend [Swift Momentum] as with this playstyle you are unlikely to have the time to build combo.

Speaking of helminth, you can infuse eclipse as it affects the stats of your stat stick which increases your ability damage as a result. you could also infuse the elemental buff abilities however they are WAY less effective. you can infuse away either your 2 or 3, I choose to remove the 3 as there aren't enough mod slots to fit the augment.

for killing in endurance with this type of build you would need a support team. something like [Mirage] with [Shock Trooper] + [Chroma] with [Smite Infusion] and a provocation [Equinox] (you could also have a [Nidus] link the [Chroma] and reconnect as one of the other frames as chroma can cache the str on his vex).
with this kind of buffing setup napkin math places the dmg per nuke at around 10-30 million depending on stat stick and if you have the [Nidus] caching. Also, those numbers are before combo being able to give you a 3.75x multiplier, and without considering supports running power donation.

For a stat stick, you want jus damage mods and elementals (and no physicals as slash/puncture only affect their half of her 1 so they are generally less useful than an extra elemental). And spoiled strike is a double edged sword as if you plan to build combo (which isn't the main purpose of this build tho) the -speed makes it very cumbersome and dangerous.

PS - Helminth - if you don't wish to use helminth remove [Continuity] so you can [Reach] 175% efficiency for more spamming (while you loose a small bit of max range, due to channel duration loss, its not a huge loss). Also Roar is worse than eclipse for this build as the 4 scales better with eclipse while the 2 (which is useless in this build) scales better with roar.