Guild Wars 2

Maybe create runes that have 5% chance to remove one condi on hit from condis ?

maybe it would be a solution for condi spamming?

or just create sigil that reduces condi duration by 10 % and if u put 2 of them on 2 1 handed weapons u get 20 % redoced condi duration

Runes
http://wiki.guildwars2.com/wiki/Rune_of_Melandru (-15% condition duration)
http://wiki.guildwars2.com/wiki/Rune_of_Hoelbrak (-20% condition duration)

Sigil
http://wiki.guildwars2.com/wiki/Superior_Sigil_of_Purity
60% Chance on Critical: Remove a Condition

I think these are what you are looking for, however if you really want the chance to remove one condition on hit I only know of one option.

Engineer Trait
http://wiki.guildwars2.com/wiki/Transmute
8% chance to convert incoming conditions into boons

GL

1st. Rune of Water removes a condition with a 5% chance when you are hit. Last I read the set was broken though.

2. Sigil of Purity removes a condition on critical hit (but can proc when you have no conditions on you).

ye but hit from rune of water doesnt count condi tick (hit) this would be change 5% from condi tick

2 sigil of purityis only 1 condi every 10 secs ,20 % + malandru ,would give u 45 % condi reduction of all condis