When it comes to using a weapon, like most things, practice makes you perfect. A character can choose to spend their downtime by training to give themselves an edge on their next adventure by sharpening the skills they already have.
Training can take many forms and provides an excellent opportunity for narrative development to show progression of the character. You should consider what kind of training they would be doing when taking this activity. Will they be testing their endurance, running or swimming over long distances? Maybe they will diligently practice some form of Kata sequence of exercises? Perhaps it may be sparring with another combatant for a more practical application of techniques?
With DTDM agreement, Training can be done anywhere there's a suitable trainer.
The Training: Physical and Martial DTA can be carried out spending either 1 Light DTA or 1 Taxing DTA slot. Only 1 Light DTA slot per DT week can be spent for the this DTA. Access to a person willing to train you is also required. This person needs to be suitable to the training you are undertaking. For example, someone skilled in combat or with proficiency in the weapon you are training with.
The person training you can be an NPC or another character of a higher level than you. If another character is training you, you are free to negotiate the costs and details of this training together with the other player. If you wish for an NPC to train you, you will need to have a narrative reasoning for them to want to help you and should speak to the DTDM to confirm. The DTDMs will also determine if the NPC requires payment in exchange for the training.
The character hones their skills practicing under the tuition of their chosen teacher. No Ability checks are needed for this activity.
Once the training is complete, the character gains a +2 modifier to their next attack roll with the relevant weapon they trained with in session in case 1 Light DTA slot was spent, or two attack rolls in case 1 Taxing DTA slot was spent.
Training like this rarely comes with any complications, the cost and training being agreed directly with the trainer before the activity begins. No complications roll is required for this activity.