Worship of "Ares"
Although Tabiti was apparently the most important deity in the Scythian pantheon, the worship accorded to the deity Herodotus refers to as "Ares" was unique. He notes that "it is not their custom to make images, altars or temples to any except Ares, but to him it is their custom to make them". He describes the construction of the altar and the subsequent sacrifice as follows:In each district of the several governments they have a temple of Ares set up in this way: bundles of brushwood are heaped up for about three furlongs in length and in breadth, but less in height; and on the top of this there is a level square made, and three of the sides rise sheer but by the remaining one side the pile may be ascended. Every year they pile on a hundred and fifty wagon-loads of brushwood, for it is constantly settling down by reason of the weather. Upon this pile of which I speak each people has an ancient iron sword set up, and this is the sacred symbol of Ares. To this sword they bring yearly offerings of cattle and of horses; and they have the following sacrifice in addition, beyond what they make to the other gods, that is to say, of all the enemies whom they take captive in war they sacrifice one man in every hundred, not in the same manner as they sacrifice cattle, but in a different manner: for they first pour wine over their heads, and after that they cut the throats of the men, so that the blood runs into a bowl; and then they carry this up to the top of the pile of brushwood and pour the blood over the sword. This, I say, they carry up; and meanwhile below by the side of the temple they are doing thus: they cut off all the right arms of the slaughtered men with the hands and throw them up into the air, and then when they have finished offering the other victims, they go away; and the arm lies wheresoever it has chanced to fall, and the corpse apart from it.
According to Tadeusz Sulimirski, this form of worship continued among the descendants of the Scythians, the Alans, through to the 4th century CE.
Read more about this topic: Scythian Religion