Progenitor for Magnetic

Normal Attack is Multi CO

Heat

Heat tends to be the standard for DoT among general use Warframes, unless against Kuva Grineer. Heat procs can refresh on each consecutive heat proc that is placed upon the target. It also offers a free crowd control when enemies are afflicted with Heat. Heat can be one of the better options overall for [Ember], [Temple], or even [Protea] and [Nezha]. [Protea] and [Nezha] can benefit from some sort of Heat Inherit, as it will boost the damage of the turrets on a "baned" Heat proc.

Electricity

Electricity Damage can be beneficial when playing Relic Cascades. Since the Kuva Grineer are resistant to Heat, Electricity will be the next best option. Electricity also does the best for warframes like [Volt], [Gyre], [Mag], and anyone that can group enemies together.

Toxin

Toxin damage is amazing against Corpus as the status proc will bypass all enemy shields entirely and DoT on the health instead. If you're tired of the ol' Viral + Electricity, Corrosive + Heat, etc... Toxin can be a fun alternative for enemies with shields. Pair it with magnetic for an electric explosion on shield break, and that's a recipe for disaster. Toxin Damage is also [Saryn]'s best friend. There are plenty of weapons out there that [Saryn] would rather use, but why not try something different on for size.