In Monoliths this build really shines, utilize Infernal Shade combined with Legion 2/2 and it's Reduced Duration to explode packs of mobs with Combustion 1/1. Whenever you find a rare mob or an Exile Mage, mark it with Bone Curse and throw out your Chthonic Fissure which will cast Flame Whip. In especially large or dangerous packs, Profane Veil will cast up to 8 Infernal Shades with the Infernal Deliverance 4/4 node to provide an incredible burst of damage while making us immune to all damage expect DoT effects.
For Bosses, prioritize maximum uptime on Chthonic Fissure for your Flame Whip and use Bone Curse manually or by pressing Profane Veil which will automatically apply our Bone Curse for us. Bone Curse is specialized to mark a SINGLE enemy but have infinite duration, which helps greatly with the Quality of Life with this build. Our Bone Curse will also apply Marked For Death to the target for an infinite duration. It is important when using Infernal Shade on Bosses or other Single Target encounters that you do not spam the spell. Wait for the explosion before re-casting Infernal Shade. Not only will you end up out of mana quickly, but casts of Infernal Shade will overwrite one another resulting in the Combustion 1/1 trait never activating. Overall you should have quite a lot of downtime between Chthonic Fissure and Infernal Shade for dodging attacks. See below for information on how the Legion 2/2 node operates on Single Target.
For our movement, utilize Profane Veil when things feel a little unsafe and Transplant to get around and directly avoid attacks.
For those curious about Infernal Shade and how the Legion 2/2 node interacts on single target, you will still generate 3 different Shades. The main difference being they will all overwrite each other resulting in only the last Infernal Shade ticking it's full duration. However, if a Blaze Shade 1/1 is chosen as any of the first two instances spawned, the explosion from Combustion 1/1 amplified by Blaze Shade 1/1 has such a short duration that the final Infernal Shade attaches to the target which is neat. So there are some positive feedback loops from Legion 2/2, Fleeting Shade 1/1, and Combustion 1/1.
This build is mainly a Critical Strike Hit based, build. Though there is some passive Ignite stacking to smooth out our lackluster Single Target performance but we do not invest into it heavily. Although the ignite chance helps scale Chthonic Fissure Hit and Flame Whip via Fissure of Wrath 1/1.
Our main pack clearing ability, Infernal Shade, scales incredibly well with Critical Strikes due to Combustion 1/1 and Flame Burst 1/1. The star of the show Flame Whip gets added PrefixCritical Strike Multiplier from our over-capped SuffixNecrotic Resistance due to Spine of Malatros, unfortunately there are not many nodes for Chthonic Fissure which are directly tied to Critical Strikes, but we pick up Forbidden Chasm 1/1 to help increase our chance to critical strike an enemy with ANY ability.
Equipment mods such as PrefixCritical Strike Chance and PrefixIncreased Critical Strike Chance For You And Your Minions, can greatly aid our Critical Strike consistency. NOTE: These mods only give a percentage increase of our "base" Critical Value, open your character panel for the specific base number, ideally for this build we would want to see ~25% if possible. This may not sound like much but due to our Skill Trees, this ends up being closer to 50% for Infernal Shade and around 40% for Flame Whip.