Here are some ideas for uses of accesorys

Vita-kit:Gives you extra health and when reviving a fallen ally you won't lose as much health while your friend gets extra health.

Parrying blade: while shielding you pull out your parrying blade and you shield will break after more hits than normal.

Bomb bandilier: Your time for bomb charge up decreases.

Scarf: It takes less time waiting when frozen.

Monster pockets: You take less damage from the monster that you have in a pocket.

Helm guards: You take less time in stun.

Hope you like there ideas!