Idle XP

Idle XP ticks every 0.25 seconds, whether or not you are doing anything. It is your main income at every stage of the game.

The formula

XP = RejoinMultiplier x elapsed
   x ServerXPBoost          -- Lucky / Hyper star events, decays toward 1
   x GlobalXPBoost          -- cross-server, same for everyone online
   x ControlPointBoost      -- 1 + hill boost + castle boost, if you hold them
   x RejoinChainMulti       -- 1 + 0.05 per chained rejoin, capped 4x
   x PersonalActivityMulti  -- 1 + PersonalActivity, capped 3, decays
   x FriendIdleBoost        -- 1 + 0.05 per friend in your server, capped 1.25x
   x (1 + clanIdleBonus)    -- from your clan's upgrades
   + PremiumIdleBoost       -- Premium only, additive

Note the last line is additive, not a multiplier: Premium adds min(25 000, floor(ServerTime)) XP per tick regardless of your multiplier. It matters enormously early and barely at all late.

The feeder values

Value	How it grows	How it decays
ActivityBoost (server-wide)	+0.05 per player join, +0.02 per NPC killed, +0.01 per orb	-1 % per second, capped at 199 999
PersonalActivity (yours)	+0.1 per player knockout, +0.05 x damage share per NPC, +0.005 per orb — all raised by your clan’s activity bonus	-0.3 % per second, capped at 3
RejoinChainCount	+1 per leave; timer +60 s per join, capped 600 s	timer expires, count resets to 0
ServerXPBoost	+2 per Lucky Star, +10 per Hyper Star	-0.1 % per second, floor of 1
FriendIdleBoost	+5 % per friend currently in your server	ends when they leave, cap 1.25x

ActivityBoost also drives RNG

RollRNG() = random() / random() x (ActivityBoost / 20 + 1)

A busy server does not just pay more XP — it rolls better enemies, better orbs and better star outcomes. Playing on a full, active server is a real multiplier on everything, not just a social preference.

Practical reading

• The single largest lever you control alone is the rejoin chain (4x).
• The largest lever the server controls is ActivityBoost, which is why star events that raise it (see Stars) are worth more than they look.
• PersonalActivity decays fast. It rewards continuous fighting, not bursts.