Abyss Overlord

How to get it: Defeat the Sobek Crocodile guardian (Coastal Dune ground ruins, Three River Junction).

Mimicry and skill

Mimicry: Tidal Mode. A tide every 20 s blocks up to 3 attacks and recedes after 10 s. Costs 1 Yellow Crystal.
Level 10 skill: Fluid Prison. Underwater only: imprisons 1 enemy for 5 s while it loses HP.
With Ascension: Imprisons up to 10 enemies; each that dies restores 10% of your max HP.
Notes: Kills convert enemy life into bonus armour.

Energy recovery	Energy use	Load	Intimidation	Starting energy
2	2	3	3	3

Ranks run from 1 to 5 in the mask's attribute screen. Highest: Load and Intimidation and Starting energy (3).

Masks guide - Mimicry, mask level, Ascension and Red CrystalsHow Soulmask masks work in 1.0 - switching masks, mask nodes and level 10 skills, Yellow Crystals for Mimicry, Mimicry Ascension, Restrictive Modules and Red Crystals.
Guardian bosses - summon items, order and levelsHow to summon Soulmask temple guardians in 1.0 - Worship Containers, Fierce, Berserk and Doom tiers, summon levels, a boss order for both maps, and the two Central Core fights.
How to beat every Soulmask guardian: gear, weapons and countersFight plans for all eight Soulmask temple guardians and both Central Cores in 1.0: the gear tier, weapon, mask, resistances and tribesmen each fight needs, and the attacks that kill most players.
Shifting Sands guide - start, regions, World Portals and map-locked itemsHow to start the Shifting Sands DLC map, what a World Portal copies between saves, which items only work on one map, the regions in order, ore locations and sandstorm protection.