Wherever the player has set up their base, it is recommended to begin searching near 0 depth, and upon finding an altar, build a room around it so the player can craft in relative peace. It is not uncommon to find an altar relatively close to the world spawn point.Altars emit a faint glow, making them somewhat easier to find in unlit areas.Smash a Demon or Crimson Altar, using the Pwnhammer. Additionally, smashing an altar will allow mechanical bosses (if said boss has not been defeated before it will spawn with a 10*1/10 (10%) chance each night) and random Pirate Invasions (if all the criteria are met) to spawn naturally.No block other than the selected one will be converted initially. Each time an altar is destroyed, there is a 66.67*2/3 (66.67%) chance that a single random Stone Block in the Cavern layer will be converted to Ebonstone/ Crimstone or Pearlstone, facilitating the spread of Underground Hallow or Corruption/ Crimson.Each time an altar is destroyed, one or two Wraiths spawn, regardless of the time of day.

No matter how many altars are destroyed, ore rarity remains set with Cobalt/Palladium being the most common, followed by Mythril/Orichalcum, then Adamantite/Titanium as the rarest.Notice that although each subsequent destroyed altar will yield less ore, the total amount is unbounded (except by the number of altars in a world). Destroying 12 altars will roughly double the ore provided by the first three tripling that original allotment would require destroying 33 altars. For example, destroying the 19th altar (seventh cycle) would yield one-seventh of Cobalt/Palladium Ore compared to the first altar. So, the n th cycle will only generate one-n th as much ore as the first one. Subsequent altars destroyed will begin the cycle again, though the fourth to sixth altars will spawn half as much ore as the first ones, the seventh to ninth will spawn only one third of the ore of the first ones, and so forth.The same goes for Mythril/Orichalcum with the second altar, and Adamantite/Titanium for the third. For example, it is not determined if the world has Cobalt or Palladium until the first altar has been smashed. Which ores are generated is not determined until the first, second or third altar is smashed.A world with Palladium Ore deposits will never spawn Cobalt Ore deposits, or vice versa (with the exception of drunk worlds ). Destroying more altars will never spawn Hardmode ore types beyond the three that were randomly assigned to the world during the initial round of destroyed altars.They will spawn at random locations in varying quantity, in places explored and unexplored alike. Players will be able to find these new ores scattered across the Underground layer to near- Underworld levels, with them replacing most blocks created during world generation. Third altar: Adamantite Ore or Titanium Ore, chosen randomly.Second altar: Mythril Ore or Orichalcum Ore, chosen randomly.First altar: Cobalt Ore or Palladium Ore, chosen randomly.Each destroyed altar will spawn a Wraith and causes one type of Hardmode ore to appear in the world, with the appropriate status message displaying in the chat: ' Your world has been blessed with !' To craft all Mythril equipment, the player needs to acquire 153 / 155 bars, or a total of 612 / 620 ores.After the Wall of Flesh has been defeated in a world, altars can be destroyed with any tool that has a hammer power of at least 80% (typically the Pwnhammer). On the Old-gen console version and Nintendo 3DS version, Mythril Bars drop from Shadow Hammers. The Mythril Drill and Mythril Pickaxe are the first tools acquired that are capable of harvesting all but two block types in the game (exceptions being Chlorophyte Ore and Lihzahrd Bricks). They are necessary to make the Mythril Anvil, which in turn is needed to make most Hardmode equipment. Mythril Bars are a type of Hardmode- bars made from Mythril Ore.

Where to find mythril anvil in terraria