The "Dragon" is a species of mob that spawn naturally in any biome in tiers under 4, and in dens, roosts, and lairs in snowy, desert, and grassy biomes in tiers above 3. They can be heard flapping heavily around the sky and usually scout around for nearby passive mobs or players. For more in-depth information go here
Dragons are usually are hostile in nature and easily can bombard players on the ground with flames or heavy damage fireballs seen in the Fire Dragon. What makes these dragons far more dangerous is Lycanite’s Mobs Mod, specifically the elementals. Not only will a player be fighting a Fire Dragon, but also an unyielding horde of Cinders and Tremors due to fires and explosions. If the player has Fire Resistance, a dragon will land and attempt to grab them with its jaws, usually killing a player in an instant. To avoid this, the player must hold “shift” when the dragon is about to bite down on them, freeing them from its animation and allowing the player to score a hit or two in.
Ice Dragons are mostly the same case, but they are not able to spawn in Cinders since they do not cause fires. Rather, their breath can leave behind spikes which can damage the player if not avoided. They are still capable of spawning Tremors because their Ice Bombs cause an explosion.
How to slay a Dragon
Killing a dragon is going to be one of the hard tasks in RLCraft. Not only do they burn you and shoot bombs at you, they are a tank. Before you fight on, you should level your defense and attack to 16 (Diamond level) and also level up your magic to use a Brewing Stand. If you already did the following you should have Diamond gear equipped. The next step is getting ingredients for a fire resistance potion, to get magma cream, you can kill lava monsters that spawn on lava pools, Salamanders are guaranteed to drop at least 1 magma cream. To get Nether wart, explore and find an ocean, if you see one of those underwater bases, enter one and harvest the nether wart and soul sand (If you want to keep making potions). After you acquired the ingredients in making a fire resistance potion you can start brewing. Get three bottles and fill those up with water, brew them with nether wart, then magma cream and you're done. Optionally, you can add redstone to make the length of the effect to last longer. Additionally you can add gunpowder so that you can also apply the effects to your flying mount. Recommended to add redstone.
After you've done brewing your fire resistance potions. It's time to gear up. Recommended to enchant your diamond gear, but unenchanted ones works. Get a stack or 2 of arrows, and an iron or diamond strengthened longbow. If everything are done you are officially prepared to slay your first dragon. Make sure to not die.
Wild dragons can only be tamed in creative with a special dragon meal (If you're on the updated version of Ice and Fire). To tame your own dragon you must find a Dragon cave that inhabits a Stage 4-5 Female dragon and slay it. Once you get the egg after killing the said dragon, put the Fire Dragon Egg on a Netherrack and light it on fire, it will start spinning and will start it's hatching. To hatch an Ice Dragon Egg, submerge the egg on some water. The dragon will wander if it's not commanded by a dragon staff. You can feed it Dragon meals to make your dragon grow into stages. You can ride your dragon when it's grown into Stage 3 or above. Do not attempt to ride or tame wild dragons, it'll result in death.
Dragons don't drop items normally. Instead you get their items, you right click their dead body and the scales, bones, flesh and heart should come out. You can also get the dragon's blood by right clicking a fresh corpse with an empty glass bottle. The corpse will disappear after you harvested the body. Additional loot can be found in their treasure chests around their roost or nest. They usually have iron, manuscripts or rarely diamonds.