Sentira is a bizarre material that is created and used in the Unity of Riedra, and occasionally by Kalashtar in Adar. Sentira is emotion, moulded into a useful shape and then solidified by psionic power, objects that are made from sentira are grown into their shapes, they aren't worked into them. Sentira has a whorled appearance, and it's surface has an opalscent shimmer to it that makes the material look like polished horn or shell, and it varies in colour depending on the emotion used to cultivate it.
Sentira is lighter than steel and is extremely strong. The Unity of Riedra uses sentira as it's primary material, constructing tools, weapons, armour, and even buildings out of it. Armor and weapons made of sentira weigh 50% less than normal, and if the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the sentira version of the armor doesn't. Heavy weapons made of sentira lose the Heavy property, and sentira weapons wielded in one hand gain the Finesse property if they don't already have it.
Sentira is a psionically resonant material, and it's not uncommon for objects made of sentira to carry psionic enchantments.