This is more of an exploit than a bug, but by using Ethereal Shift while your ice path is flush with the ground (as low down as it can go) Kelvin can get under the map and is able to ice beam people through the floor. With superior cooldown you can stay under the map for the entire game and...
Weapon needs an active item in its Tier 1 shop to match the other 2 item categories, so here's my idea for a simple one:
Reaching Bullets- +7% Weapon Damage, +50 Bonus Health
Active (35s CD): Gain +20% Weapon Fall-off Range (and bullet lifesteal?) for 6s.
Think some characters need bullet...