Neverwinter

In general, those who completed Tiamat before the update at lvl 60 are the lucky ones! Now all mobs have been increased by lvl 12, the damage is colossal, it is very stressful to survive under the endless pressure of minions. In general, there is only one way out - to monitor the guilds that are going specifically to Tiamat for 25 snouts, either on the forums or in the game (it’s more difficult in the game) - with randoms, completing the event was practically reduced to zero. The most difficult achievement of the DLS - it’s easier to stupidly neglect it, nerves are more expensive.

To defeat Tiamat you need a group of 25 players. Go to the "Dragon Spring" location and look for a party through chat, it is easier to do this with investment levels 3 and 4 ("dragon treasures" brought into the cart - the cost of investment points). The higher the level of investment, the better the reward, the more people want to farm this fight. The current level is indicated in the window in the upper right corner of the screen.

After you are invited, you need to look at the selection queue (there are 5 groups of 5 people each) and remember which group you are in. Tiamat has 5 heads of different colors, they are located on the edge of cliffs in this order (from left to right): black, green, red, blue, white. The 1st group jumps to the black head, the 2nd to the green, the 3rd to the red, etc.

Stage 1 - killing summoners. Each group kills the corresponding summoner on the cliff. All players take the “dragon stone” left behind, which gives immunity from attacks from one of the heads. The stone must be placed in one of the slots for potions. We run back to the gate and kill Severin.

Stage 2 - protection of clerics.

Left cleric - attacked by black and green heads (death damage and poison damage).
Central - green, red and blue heads attack (damage with poison, fire and lightning).
Right - blue and white heads attack (lightning and cold damage).

The 1st group protects the left cleric, the 5th - the right, all the rest - the central one. It is advisable that each group has a healer or a tank. We clear the waves of mobs until Tiamat weakens. In order not to constantly shift away from red zones, we use the dragon stone.

Stage 3 - expulsion of Tiamat. There is no need to cross the red line on the ground, you should wait until it disappears, otherwise the instance may become buggy. Heads are killed from left to right, starting with the black one. We use the dragon stone on the head of the corresponding color, especially on the blue one (100% one-shot, you will have to run again - waste of time) and white (freezes the player, taking him out of the battle for 10 seconds - waste of time). If desired, you can use a dragon slayer potion and scrolls of protection from dragons.
The idea is to kill all the heads before the timer runs out. If you didn’t manage to kill at least one, then they will all be reborn, restoring a small amount of health, and you will have to protect the clerics again. If the random party is weak, it is better to initially leave 3-4 health cells at the heads during transition phases and move on to the next head. The heads are finished off from right to left, starting with the white head.
It's better to go with your guild/alliance. It is enough to have 2-3 strong damage dealers that will carry through everyone else.