Tarchia
Tarchia is a Rank S Elite Mark found in Amh Araeng.
Killing the Elite Mark will reward the player up to 
100 Sack of Nuts, 
100 Allagan Tomestones of Poetics, 
30 Allagan Tomestones of Causality, 1 
Cracked Planicluster and 1 
Cracked Stellacluster.
Coordinates
| Zone | Coordinates | Level range |
|---|---|---|
| Amh Araeng | (X:10.3, Y:11.7) | 80 |
| Amh Araeng | (X:16.6, Y:10.8) | 80 |
| Amh Araeng | (X:11.8, Y:19.4) | 80 |
| Amh Araeng | (X:18.9, Y:16.5) | 80 |
| Amh Araeng | (X:16.6, Y:24.1) | 80 |
| Amh Araeng | (X:19.2, Y:24.9) | 80 |
| Amh Araeng | (X:17.2, Y:31.6) | 80 |
| Amh Araeng | (X:19.6, Y:36.6) | 80 |
| Amh Araeng | (X:30.5, Y:35.4) | 80 |
| Amh Araeng | (X:32.8, Y:33.8) | 80 |
| Amh Araeng | (X:28.8, Y:26.2) | 80 |
| Amh Araeng | (X:28.5, Y:20.7) | 80 |
| Amh Araeng | (X:33.5, Y:22) | 80 |
| Amh Araeng | (X:28.8, Y:12.7) | 80 |
| Amh Araeng | (X:30.8, Y:14.1) | 80 |
Spawn Conditions
Trigger
Cast 
Self-destruct on spawn points.
Time
84 to 132 hours after it's been killed; or alternatively 50 to 80 hours after maintenance has ended.
Tips and Tricks
Tarchia spawns with a 
Sleep debuff. Upon taking damage, Tarchia will wake up and immediately cast an untelegraphed Mighty Spin attack.
- Wild Horn is an untelegraphed conal AoE targeted at the main tank.
- Metamorphic Blast is large AoE that affects up to 32 players based on proximity.
- Trounce is an untelegraphed short conal AoE in front of Tarchia. Move sideways.
- Mighty Spin is a telegraphed circle AoE.
- Bafflement Bulb pulls nearby players to Tarchia and applies Temporary Misdirection, making it hard to avoid the next mechanics.
- Forest Fire is proximity AoE. Run away.
- Groundstorm is a donut AoE. Run to the center. Followed up by an untelegraphed and uncasted Mighty Spin.
If you anticipate getting hit by Bafflement Bulb: run to the center. If it casts Forest Fire, any direction you run will save you. If it casts Groundstorm, you're already in the center. After Groundstorm, run out so you don't get hit by Mighty Spin.
Description
“Tarchia is a saichaniae that plays host to parasitic vegetation that feeds off its host's aether. Poor bugger, eh? It's awfully difficult to track down, but it is said to be somewhat, er...excitable in the presence of death. I reckon it's anticipating the impending release of aether. Like if someone were to wave a freshly cooked haunch of mole meat under your nose. That said, not all deaths are created equal. The flashier the better, if that makes any sort of sense? Distance is key too, I'd imagine. No point in putting on a show if the host is nowhere nearby. Maybe something explosively loud, too? I don't know, you'll probably think of something if you put your mind to it.
— Haline
“Believe it or not, Tarchia is actually a parasitic plant that feeds on Saichaniae. It is extremely difficult to find, but it is supposed to be, uh ... fascinated by the presence of death. I suspect she awaits the release of aether. As if someone would hold a freshly cooked portion of garbage under his nose. However, not all deaths are equally interesting for her. The brighter the better, if that makes sense to you ... I think the distance also matters. After all, there's no point in taking off a show when there's no one around. Maybe some loud explosions? I do not know either, maybe you can think of something.
— German Translation
“Tarchia? He is of the family of the saichaniae, but it is difficult to see compared to his congeners. The poor man was infested with a parasitic fungus. It is even said that he becomes crazy when he feels death coming for someone! It seems that it is because he eats the ether expelled creatures at the time of their death. In any case, if you want to be that who will be remembered as having managed to shoot this monster, I advise you to stage your death and wait for it to happen to take him by surprise. But beware, if you're too far away, he will never see your little carousel ... In my opinion you should cause a big explosion, something extreme! Well, I do not know how, on the other hand, but I'm sure you'll find something, go.
— French Translation
“"Tarkia" is a kind of saikania. It is said that this pathetic being made into a nursery of a parasitic plant is weirdly sensitive to the death of other organisms. Apparently, it seems to be because the parasitic plant seeks as a nutrient for the aether that is sprayed when the organism dies. Anyway, if you want to kill this monster and name it, it would be nice to show off and show up the death. However, if you are far away, you may not notice the direction. If you pretend to be dead, it would be good to do it with an explosive sound. I have no idea how to do it.
— Japanese Translation
Lore
“Tarchia plays host to parasitic vegetation that feeds off the saichania's aether, resulting in erratic, unpredictable behavior. This makes the creature difficult to track, but it is said to be sensitive to the promise of death—likely drawn by the potential release of aetherial energy. Thus, the most effective method for luring it out is to stage an explosively loud demise.
— Encyclopaedia Eorzea Volume III, p. 294