Netherworld Explorer

You have decided (some would say “understood”) that the best place for an adventurer to forge their mettle and fight evil is the ancestral ruins and endless tunnels of the Netherworld, with their eccentric fauna, countless dangers, immeasurable riches, and inexhaustible mysteries. It is a world much different from the one that people of the surface know, a universe fraught with peril that filled you with terror at first, but one you eventually gained familiarity with. Your affinity with the depths has made you a force to be reckoned with in every circumstance, and your skills draw the interest of many, whether as a guide, a cartographer, or simply an explorer burning to discover the secrets of the world below.

Underground Acumen

When you choose this archetype at 3rd level, you confirm your experience with the Netherworld and its tunnels. You can speak, read, and write Undercommon and have advantage on ability checks related to social interaction with denizens of the Netherworld.

You also have advantage on Wisdom (Perception) and Intelligence (Investigation) checks to detect traps and secret passages. In addition, you have no disadvantage on Wisdom (Perception) checks in lightly obscured areas.

Footwork

The treacherous environment of the Netherworld has trained your agility. Starting at 3rd level, you can move among your enemies without dropping your guard. On each of your turns, as a bonus action, you can make a 5-foot movement that doesn’t trigger opportunity attacks. The movement increases to 10 feet at 7th level, and to your speed at 11th level.

Tunnel Master

At 7th level, you gain a talent reflecting your ease in the depths. Choose one of the following features:

• Supernatural Ascendancy. Your magnetism and experience with uncommon fauna allow you to cast dominate beast as an innate spell. Moreover, for the purpose of this feature, dominate beast also applies to monstrosities with an Intelligence score of 2 or less. You can’t use this feature again until you finish a short or long rest. At 11th level, the duration of the effect increases to 1 hour.
• Exterminator. When there are several enemy creatures within 5 feet of you, you gain a bonus to attack and damage rolls equal to the number of creatures within 5 feet of you minus one. At 11th level, this bonus also applies to your Armor Class.

Martial Adaptation

Exceptional adaptability is a key skill for survival in the Netherworld. Starting at 11th level, you immediately learn from your mistakes during fights.

Every time you miss a weapon attack against an enemy creature, you gain a stacking +1 bonus to the attack rolls of your weapon attacks against this specific creature. This bonus lasts until you finish a short or long rest.

In addition, your weapon attacks score a critical hit on a roll of 19 or 20.

Slayer of the Depths

When you reach 15th level, you become a fearsome predator of the Netherworld, gifted with razor-sharp senses and deadly accuracy. When you score a critical hit with a weapon attack against a creature, your next successful weapon attack against this creature is resolved as a critical hit (this does not trigger this feature again). This lasts until you finish a short or long rest.

You also gain blindsense in a 60-foot radius.