About the Skill:
Detecting Hidden can be used to reveal hidden players and traps. There is both a passive and active form of Detect Hidden. When invoking this skill (active use), the character is given a targeting reticule and asked, "Where will you search?" The skill check is run when an area is selected. If successful, hidden characters and traps within the search range will be revealed. The further a hidden character or item is from the targeted tile, the less chance to detect successfully. Detect Hidden works against both Invisibility and Stealth, though not equally. Invisible characters are easier to detect. Use of the Detecting Hidden skill in a home the character owns or is friended to is always 100% successful. A stealther may re-hide immediately upon detection, wherein Tracking should then be used.
There is a 10 second delay between uses of Detecting Hidden.
The passive Detect Hidden range against a character using Stealth is a 4 tile radius; stealthers are advised to stay at least 4 tiles away from others.
Publish 97 removed the need to have Detect Hidden in order to train the Remove Trap skill.
The radius of detection is based on your Detect Hidden skill.
Your chances of finding a hidden player depend on the relationship between your Detect Hidden skill and their Hiding skill.
House owners, co-owners and friends are able to instantly reveal anyone hidden in their house regardless of skill level. You cannot gain skill by using Detect Hidden on the house floor.
Having a high Detect Hidden skill helps to automatically reveal people that stealth in your vicinity; The passive Detect Hidden range against a character using Stealth is a 4 tile radius.
The Detect Hidden skill also helps you when you are using the Tracking skill and when you use the Reveal spell.
All human characters have Jack of all Trades of 20 Detect Hidden
All elven characters have a racial bonus increased chance to passively Detect Hidden.
Passive Detect Hidden is not active in “Abyss” ruleset shards.
Kotl City, Exodus Dungeon and the sands around the wreck of the BMV Ararat have hidden containers which can be found using the detect hidden skill. If your skill is high enough, you will passively detect the boxes, receiving the message ‘your keen senses detect something hidden in the area’. You must then use the skill actively to locate and reveal the container. Exodus and BVM Ararat container types have 2 traps, poison and explosion. the Regal Box from the Kotl City has Poison and Dart trap
The training aid Crystal Ball of Knowledge obtained from Ortlem the Mystic’s quest is particularly useful, the difficulty of the skill being related to the distance from the target.
Too Easy = on the hidden box but failed attempt
Very Easy = 1-2 tiles away
Easy = 3-4 Tiles away
Optimal = 5+ tiles away
How to train:
You will need to have tinkers of different skill levels create trapped chests for you. For starting off after training with an NPC have a tinker that makes trapped boxes for breaking paralysis make a trapped box for you. The tinker should have a skill level around 35. This will take you to roughly 60 detect hidden, at which point you can start using a trapped box made by a GM tinker. For faster skill gains you can allow a Satyr to use the Discordance skill on your character in the Twisted Weald once you reach around 50. This will allow you to use the lower level trapped box for much longer.
With the classic client create a single button macro to use the skill on your last target. Manually use the Detect Hidden skill on the box once, then continuously press the macro button to continue training. For the enhanced client create a new hotbar and drag the Detect Hidden skill icon to it. Then place the box on the ground if you are not using the enhanced container option, or you can leave it in your pack if you are using the enhanced container option. Then right click the icon on the hotbar, choose target, and choose "stored" and target the box. After that you can use that macro to train your skill.
Buy 30+ skill from a Thief Guild master (there's one in new haven)
You cannot gain skill by using Detect Hidden on the house floor. but if you lock down and trapped Small Crate and then using the Crystal Ball of Knowledge stand one tile from it and detect hidden the crate. as you gain in skill you will see the message changes to easy, you then need to stand 1 tile further from the crate and the difficulty will change to optimal again. keep moving each time it gets easier. by 90 skill you should be about 8+ tiles away so make certain you have room to move.
How to make your own training box to take you all the way to GM.
buy 30+ tinkering from trainer in haven
buy 50 boards, 10 iron ingots and tinker tools from them as well.
buy 10 bolts from a Fletcher in new haven
make carpentry tool
use Carpentry tool to make Small Crate with 0 skill you have 75% chance... [this is wrong, you need 10.0 skill now]
use tinkering tool to make Dart Trap with 1 ingot and 1 Bolt