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Better Shieldwall

Since people have been complaining how bad the utility of shieldwall provides (particularly the unit providing shieldwall also needs a cover themselves), also as a turn ending move means you cannot use grenades (which ends the shieldwall in this case, unlike EW) or other support abilities, this make shieldwall close to useless to a lot of people, this mod gives shieldwall the ability to grant the provider himself a heavy cover effect, so shieldwall can be used on open spaces without risking the provider, at the cost of not doing anything else that turn.

NOTE: Activating this mod mid tactical game save will not do anything until the next tactical mission.

KNOWN ISSUES:
- Shieldwall don't actually give the provider a heavy cover, but an effect that provides defense equivalent to heavy cover (will not stack if the provider is already in heavy cover) and negating flanking crit bonus, they will still take bonus damage from hunter's instinct and bonus aim from scopes. I can't get around this because I don't know how to make heavy covers that don't block LOS, and surrounding a unit with LOS blocking objects is a bad idea.
- There's no thumbnail because the workshop uploading tool is being stupid again

WARNING: As any XCOM 2 mods do, saving a game with a mod enabled will cause the save game only work if and only if the mod is enabled, since this mod adds new effects to abilities that affects only the tactical layer, do not disable the mod in tactical game, only in strategic game. If you want to do so use https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=619141883

Problems? Follow this guide first! it may solve your problems (applies to all mods) https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=625230005

Compability Info:
This mod does not override anything, it should be compatible with all mods.