trap smith

you are a trap smith, you are really smart when it comes to making traps, at higher levels you can trap spells in traps like power word kill,                       

tool proficiency:

you gain expertise in thieves tools, and if you already have expertise in thieves tools you gain a proficiency in any other type of artisans tools 

trap master

starting at 1st level, you gain the following benefits:

you have advantage on all checks/saving throws related to traps

when you create a trap you can choose to  make your artificer spell save dc be the dc of  all checks necessary to detect or disable it, as well as to any saving throws the trap forces creatures to make.

improved trap master

starting at 9th level, you gain the following:

you gain +2 bonus to the dc of all checks necessary to detect or disable traps you create.

this bonus also applies to saving throw dc's of your traps.

spell trap

starting at 5th level, to create a spell trap you will need a trigger (pressure plate, tripwire etc.) 1 hour of work with your thieves tools an spend a spell slot of 3rd level or higher. the trap can be triggered a number of times equal to your intelligence modifier (minimum of 1) or until you disable it (disabling it requires your action).when the spell trap is triggered, the trapped spell immediately effects the triggering creature (and only the triggering creature); the inserted spell must be of the same level or lower as the level of the spell slot you expended to create this spell trap. the trap counts as magical, and casting mending or dispel magic on it has no effect. once you created a spell trap you can't do so until you finish a long rest. 

improved spell trap

starting at 15th level, you can have someone else insert a spell into your spell trap. to do so they must stay in 5 feet of you for the entire hour you spend creating the spell trap, and also they expend a spell slot of 5th level or higher. then , the inserted spell is treated as if they would have casted it using their spellcasting  ability, spell save dc etc. the spell trap created in this can way be triggered a number of times equal to their spellcasting ability modifier (minimum of 1) instead of your intelligence modifier. 

additionally, your ability to create a spell trap recharges on a short /long rest, and disable your spell trap requires your bonus action/action.